Case Study: We Need These Coils on a (5) Day Quick-ship

In late June, Capital Coil received a call from a Trane office in Ohio regarding quick-ship availability. One of Trane’s top customers had an urgent need for (12) large chilled water coils with stainless steel casing. The problem/hurdle that they were encountering was that they needed all (12) coils to be built and ship out of the factory in (5) business days. Completion of the whole project was 100% contingent on them receiving the coils in their specified time-frame. An additional complication was the fact that July 4th was the following week, and they needed to have the coils ship prior to the holiday.

Trane shopped the project around to different manufacturers, but not one could guarantee to ship in (5) days. Some manufacturers waffled and claimed that they could have them built in (6) or (7) days, but not one could guarantee to ship in (5) days. A sales rep in that same Trane office, who had worked with Capital Coil previously, suggested that his co-worker reach out to us to see what we could do. After speaking with Trane’s project manager, we immediately contacted our head of production to make sure that we had the capacity to complete all (12) coils in the required (5) days. She assured us that we had the materials and manpower on-hand to get them all built and ship on time. We agreed to accept the project and began work on the coils immediately.

Due to the size of the project, as well as it’s time-sensitivity, we had multiple calls daily with our factory to ensure that everything was proceeding on schedule. We then gave Trane daily status updates, so they were constantly informed of everything from the brazing of the coils to entering the final testing phase. Chilled Water Coil

As promised, all (12) coils were built correctly and shipped out in the required (5) days. Our logistics team was then in constant communication with the freight company to make sure that the delivery was on schedule. And just like during the production phase, we passed daily tracking updates along to Trane, so they knew where their coils were at all times and when they could expect delivery. All (12) chilled water coils arrived on July 3rd with zero freight damage, and the project was completed on time!

A company as large and influential as Trane can have their coils built by anyone, but Capital Coil was the only manufacturer that could guarantee to have their coils built and shipped by a required date. Additionally, in working so closely with Trane throughout the whole process, they were kept up-to-date in real time from the start of production to final delivery.

Capital Coil offers a level of service that you won’t get with other manufacturers. When we guarantee to ship by a certain date, we stand by that guarantee, or you do not pay!

 

Trane’s project manager’s comments to Capital Coil upon completion/delivery:

“This will help us get a jump on this project prior to the big event taking place next week! 

I will make sure to share your information with others across our great lakes region about our experience with your company, so that they know we have THIS option to go to for our coil needs. THANK YOU ALL!!”

Different Types of Steam Coils

There are two types of steam coils:  standard steam coils, which are used in most reheat applications, and steam distributing coils, which are used in applications where the entering air temperature is below 40 F degrees.  Many times, this type of coil is also known as a “non-freeze” coil, but that name is misleading because in reality, there is no such thing as “non-freeze”. 

Standard Steam

Standard steam coils operate a lot like hot water coils, but the construction is very different even if the coils appear to be constructed the same.  The supply and return connections are often on the same end like a hot water coil.  But, steam is very different than hot water, and the coil must be built for and circuited for steam.  Keep in mind that steam is always more erosive than hot water.  The brazing and tube wall thickness must account for steam. ALWAYS remember that even low pressure steam is more erosive than hot water, and a steam coil needs to be built accordingly.

Steam Distributing (Non-Freeze)

Steam distributing coils are a completely different type of coil because they are constructed as a tube within a tube. Every place that you see an outside tube or header, there is an inside tube and header that you can’t see. The steam on the inner tube keeps the condensate in the outer tube from freezing.  The purpose of the Steam Coiloriginal coil design was to distribute the steam evenly along the length of the coil and to eliminate any dead spots on the coil.  A byproduct of this coil was also found.  The coils didn’t freeze nearly as easily as the standard steam coil, so the coils became known as “non-freeze”, which as mentioned, is not completely accurate.  Any coil can freeze under the right conditions, but, this design is what needs to be used when the entering air is under 40F degrees!!! 

Steam Coil Design

Steam coil designs can be very tricky.  Steam coils are totally a function of the system and installation, while other coils operate more independently of the system.  There needs to be correctly designed traps, and they need to be installed in the correct place and depth in the system.  Often, vacuum breakers are also needed in the system.  The piping must also be installed correctly to make sure the steam is entering the coil and not the condensate.  Even with all of those factors, you’ll need a correctly designed steam coil that matches the steam pressure, length of the coil, and the entering air temperature.  Coils can freeze easily.  Coils can be too long in length and the steam cannot travel the length of the coil and distribute evenly.  Condensate can easily be trapped somewhere in the coil, and the result is water hammer. 

Capital Coil & Air has years of experience designing steam coils, and is here to answer any questions and help to design the right coil for your project! 

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HEATING SEASON WILL SOON BE UPON US

 

Top 5 Reasons Commercial HVAC Coils Prematurely Fail

Capital Coil & Air has come across virtually every scenario over the years in which a commercial HVAC coil had to be prematurely replaced, and we have since created an easy guide targeting the main reasons HVAC Coils prematurely fail.

  • Coil Plugging: If you are not changing filters and/or your commercial HVAC coils are not properly cleaned in a timely manner, your coil will actually begin to act as a filter. When dirt builds up on the coil, that blockage prevents heat transfer and can cause an approximate 20% to 40% drop in performance. Dirt adds to the coil resistance and can be a primary cause for your coil to fail prematurely.
  • Vibration: When your HVAC coils are installed near a moving piece of equipment, vibration can occur and cause leaks. You can tell if vibration is the main cause if leaks are near the tube sheet and look like they are slicing through the tube. If/when that happens, the coils should be isolated from the rest of the system to prevent vibration from causing damage. One way to combat this is by oversizing the tubesheet holes, but many manufacturers will not do this. Condenser Coils are usually the most common victims of vibration.
  • Corrosive Environment: This applies to both the air in the environment and inside the tubes. For instance, if there is a corrosive element in the air, it will eat away at the copper tubes; whether you have 0.020” wall or 0.049” wall. This is very common in coastal areas where there may be salt in the air. To keep the costs down from going to a stainless steel or cupro-nickel coil, we usually suggest coating the HVAC coils. Coatings are almost always within your budget, and its application will only add about a week to the overall lead time. Steam condensate and untreated water can cause corrosion within the tubes of HVAC coils as well. If you have a steam coil that has failed before the one year warranty, there’s a great chance that corrosive agents are in the steam, and it’s eating away at the copper tubes.
  • Freeze-Ups: Most people think that when HVAC coils freeze, the water or condensate laying in the coil freezes into ice and it expands causing the tubes to bulge and eventually spring leaks. What really happens is that the coil will freeze in multiple areas simultaneously, and it’s the pressure between these areas that cause the tubes to swell and eventually burst. These are very easy to spot as the leaks will run the length of the tube rather than around the tube.  ALSO be very careful when considering “freeze-proof” coils!  If you remove 5-6 inches from the fin length to make the “freeze-proof” application fit, your coil’s performance will suffer considerably. 
  • System Design: You would be amazed to learn how many HVAC coils were never designed properly for their systems. If there is a design problem, replacing the coil will only waste time and money; while you have done nothing other than duplicate the previous problem. A little known fact in the replacement market is that a high percentage of all our projects are because the coils were built incorrectly or were never designed correctly in the first place. In some cases, owners attempt to improve the coil’s performance by adding additional rows. Most however do this without taking into account the air pressure drop or fluid pressure drop that comes with it.

When dealing with an HVAC coil manufacturer, try to partner up with one who will walk you through the engineering and explain it along the way. Capital Coil & Air has well over a decade of experience and can help you diagnose whatever problem that you are experiencing correctly the first time. We look forward to working with you on your next project!

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Syracuse University Athletic Dome Renovation

Capital Coil & Air prides itself on its ability handle all jobs – large or small! We quote anywhere from 25-50 projects/day, and there is typically a very diverse mixture of equipment and overall size & scope of projects that need to be engineered and quoted. The majority of our business comes from repeat customers because they know that we treat every job and request with the same importance – regardless of size. Today’s newsletter highlights one of our largest jobs to date to illustrate the fact that Capital Coil has the ability handle any job…no matter the size and scope.

Capital Coil has long understood that your businesses and customers depend on fast responses, fast engineering, fast shipping, and top-quality products. Again, whether it’s (2) small hot water duct-coils that you need overnighted, or banks of chilled water coils, Capital Coil wants you as our customer to be satisfied that you got a “fair-deal” with us on each and every job.

The Syracuse University Dome (SU Dome), in Syracuse, NY underwent an extensive renovation at a cost of $205 million. The old roof was air-inflated/supported and was replaced with an updated design-frame roof. As part of the total renovation, the building also changed out it bathrooms, Wi-Fi, LED lighting, and entire HVAC system. As part of the renovation, Capital Coil was asked to build (64) chilled water coils as a part of the air conditioning renovation project.Capital Coil

Modular Comfort Systems, located in Syracuse, contacted Capital Coil & Air during the planning and budgeting phase of this project. Modular Comfort Systems is a large and highly respected HVAC Representative in central New York State. After purchasing coils from CCA, they re-sold those same coils, as well as other HVAC equipment to the also very highly respected Burns Bros. Mechanical Contractors – also located in Syracuse. Burns Brothers has been working in HVAC, plumbing and process piping for more than 100 years. Both of these companies are the types of companies that Syracuse University would entrust with such an important and high-profile job.

Capital Coil built (64) free-standing chilled water coils in sizes ranging from (33” x 93”) – (33” x 118”). All (64) coils are (8) rows with 304 stainless steel casing, increased tube wall thickness of .035”, with connections built and oriented at 90 degrees to facilitate ease of piping. The coils have all been highly engineered and are exactly correct for this application/project. Each coil weighs over 1,000 lbs, so Capital Coil split up the total order into (2) separate shipments, two weeks apart, in order to help the contractor receive the delivery.

The point of this case-study is to show how proud Capital Coil & Air is to have been tasked with building coils for such a high-profile project. Capital Coil is also proud to have worked with professional organizations like Modular Comfort Systems and Burns Brothers Mechanical. But regardless of the size of the project, you’ll receive the same attention and support as anyone else who reaches out for our assistance. Please contact us as we look forward to working with you on your next project!!

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1. When measuring HVAC coils, performance has very little to do with accurately measuring for replacement coils. Fitting the coil in the existing space with the least amount of labor has everything to do with measuring a coil.  If you duplicate the coil in almost every respect, the performance will match and take care of itself.  New is always more efficient than old.

2.  If you’re ever in doubt about a dimension, smaller is always better than bigger. You can always “safe off” around any coil as long as you can fit it in the space.  If a coil is too big, it makes a really ugly coffee table in your shop.  Too big is the enemy of measuring coils.

Chilled Water Coil

3.  The fin height and fin length are not the determining factors in measuring a coil. The overall casing dimensions are the most important, and you work backwards to determine fin dimensions.

4.  The depth of any coil is the total casing depth in the direction of airflow. The height is the number of tubes high in any row.  Depth is a function of rows deep and height is a function of tubes in a row.

5.  Overall length (OAL) is not the fin length and it’s not the casing length. It is the length from the return bends to include the headers that are inside the unit.  Again, it is necessary to work backwards to get the other dimensions once you know this critical dimension.

6.  Circuiting is the number of tubes connected to the supply header. Generally, you just want to count the number of tubes connected to the header and that will tell you whether it’s full, half, or even a double circuit.  It does not matter how the return bends are configured.  Your goal is to count the number of supply tubes and all performance is based on that.

7.  Fins are measured in fins per inch. Hold a tape measure up to the coils and count the number of fins in one inch.  If you can’t get in to take the measurement, a safe rule of thumb is 10-12 fins/inch.  That will work on almost every coil.  The exception to that rule is a condenser coil.  14-16 fins/inch on a condenser coil is usually pretty safe.

8.  Connection locations are difficult only if you are using the existing piping in the system (which are welded). Copper piping is brazed and can be changed easily.  If a system is old and the piping is being replaced as well as the coil, the connection location is not a major deal.  It’s very easy to match up!

9.  With replacement coils, the concept of “left hand vs. right hand” doesn’t actually exist. Connections are “top left-bottom right” or vice versa.  Ideally, all coils should be counter-flow which means that the water and air flow in opposite directions.  The air hits row one first and the water is piped into row eight first.  However, there are lots of installations that are piped backwards, and they work just fine.  Just match them up, and the coil’s performance will be equal to the old coil.

10.  Connections are not measured from the top of the header! They are measured from the top of the casing to the centerline of the connection.  Or the bottom of the casing to the centerline.  You need a point of reference, and the header height can be anything just as long as it doesn’t stick above or below the casing height.

 

All of the above “suggestions” or “secrets” are in no particular order.  They are just things that you should know to ensure that you are selecting the correct replacement coil. While most seem like common sense, your best bet is to talk with the sales team at Capital Coil & Air, who can walk your through the entire process and help you to fill out coil drawings when trying to measure the dimensions.

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Large enough to service all of your commercial replacement coils, but small enough to care about what you think

With replacement coils, as a customer, you have more choices than ever. But don’t you ever get tired of dealing with largely nameless corporations with high staff turn-over? As you’ve probably Replacement coilsexperienced first-hand, there are plenty of companies in the HVAC industry that fit this description. You are simply a number or a project instead of a customer/partner with a name and face. If given the alternative, would you rather deal with a company who knows you and is interested in your success, or a company who’s sole interest is finding out when your check is in the mail? Don’t you want somebody that values your business, regardless of the $ amount, and will go the “extra mile” for you when you need it? Capital Coil & Air places a great emphasis on those attributes in our business relationships, and common sense tells us that you probably do as well.

Capital Coil & Air was created as a family-owned business, with Matt and Dan Jacobs as joint owners and partners. What differentiates Capital Coil & Air from our competition is that we are big enough to handle all of your coil requirements, but still small enough to know who our customers are and what they need. We have decades worth of knowledge and expertise, and because of that, we have learned to not try to be all things to all customers. Capital Coil’s knowledge and experience is in the replacement and design/build market, and we are very disciplined at “staying in our lane”. Additionally, we’d much prefer to have customers and relationships that last years instead of one-off transactions. Working with Capital Coil is as simple and easy as it gets, and here are some examples:

  • When requesting a quote, we almost always respond within the same hour, or within 24 hours at the latest.  We recognize that there is an urgency to almost every coil order, and your time is valuable. In the end, a 3 day delay for a quote and/or revisions to said quote, is the same as if the manufacturer shipped your coil 3 days late.
  • When you place an order with us, we’ll send you an order acknowledgment within 24 hours detailing what you ordered, overall costs, and when it is going to ship.
  • We understand the value and necessity of clear communication. To minimize mistakes, we attach submittal drawings for every quote and order. We want to communicate with you throughout the entire buying process to make sure we are building exactly what you need.  More communication leads to less mistakes and wasted time.
  • We follow up on our shipments very carefully. We’ll work with both you and the carrier to help track your shipments to ensure your order gets to you the fastest way possible.
  • We will not ignore you simply because a sale is complete. Before, during and/or after installation, we’re here to answer your questions and help in any way possible.
  • If you need some help on pricing, we’ll do our best to work with you. While every job is unique, we want to work with you for the next 20 years, rather that a one and done purchase.

You now have some insight into our values and who we are at Capital Coil & Air. Please contact us for any future coil requirements. We greatly value your business and look forward to be your coil replacement partners on your next project!

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How Did The HVAC Commercial Coil Replacement Market Originate???

How in the world did the commercial coil replacement market start? This specific newsletter is more of a story than anything technical that we have covered in most of our previous emails or blogs. Rather, this is the story of how one manufacturer’s representative, Robert Jacobs, almost by accident, stumbled upon the concept of the coil replacement market back at a time when the only way one could get a replacement coil was to go through the original equipment manufacturer – (OEM). In full disclosure, Bob Jacobs is the VP of Business Development with Capital Coil & Air.

Way back in the day – (1970’s) – HVAC coils were not stand-alone pieces of equipment as they are considered by some now. Coils were nothing more than a single part in an Air Handling Unit (AHU) or a bank of coils. Like a bearing, a drive, or fan wheel, coils were simply part #’s that one needed to reference with the OEM in order to get a replacement built. This situation was a very good deal for the OEM’s because much like car parts, they could charge upwards of 3x’s the original cost of the coil or “part”. And, it was built according to their schedule/timeline, not yours’.

In the 1970’s, Bob Jacobs was a manufacturer’s rep in the Philadelphia-area, and his main line of equipment was Bohn Aluminum & Brass. Bohn was a division of Gulf & Western and competed against many of the top manufacturers, such as Trane & Carrier. For comparison-sake, Bohn was very similar to what Dunham-Bush is today.Commercial Coil Replacement

During this period, Bob Jacobs was asked by numerous local contractors to replace old and/or broken coils. Due to the lack of a quality alternative, he initially used Bohn for coil replacement projects, but replacing coils was not exactly Bohn’s “sweet spot”. It should be mentioned that during this period, replacement coils were not really on any manufacturer’s radar as a separate product – hence the point of this story. Regardless of the OEM, standard lead-times were upwards of (12) – (14) weeks, and those “replacement parts” were very expensive. It was during this period that he realized that there was serious potential for some kind of HVAC coil replacement market. To test this theory, he initially spent $75.00 on an ad deep within the classified section of “Air Conditioning & Refrigeration News”. It was the old type where one had to “circle the bingo card” to request additional information, and this single ad received over 525 inquiries from across the country!! This eye-opening initial response to his idea made him realize that he had come across something good, but now the challenge was how to satisfy this new market. Bob Jacobs initially contacted Bohn to see if there was any interest in building replacement coils, as well as marketing the idea across the United States. Bohn essentially laughed at the idea and countered that he’d be violating his sales rep agreement by going into the territories of other reps. This was very flawed reasoning as none of the other reps were engineering or selling replacement coils in the first place! Within a week, he had canceled his agreement with Bohn and was looking for alternative vendors. He also decided to run a second ad that received another 450 inquiries; furthering his idea of the need for a coil replacement market.

The next step was to reach out to Singer Coils (yes, like the sewing machine), who was located in North Carolina. Because they had built coils for other manufacturers, he pitched his idea to them along with the request that they build his special or “custom” coils. While initially skeptical of the concept, the doubters were proved wrong as his firm gave Singer over $3,500,000 in business in that first year alone. Admittedly, that $ amount in the first year in a brand new market is impressive whether it’s 1971 or 2021!!

One must also remember that these were the days before fax machines and most certainly before email and the internet. Quote requests for coils were received via USPS and were hand-drawn sketches written on things, such as legal pads, envelopes and pretty much every way imaginable compared with today. Because everything was starting from scratch at this time, there were no coil model libraries or other materials to cross-reference, so going through a random building trying to locate the correct coil to replace could be torturous. However, over the next 6-8 years, his business grew quite rapidly, and he was able to collect and build a substantial reference library of coil drawings and other relevant information. The experiences of the prior 8 years, coupled with his firm’s knowledge of commercial coils, eventually allowed his company to begin building their own replacement coils for the 1st time, rather than relying on a 3rd party manufacturer.

Bob Jacobs’ original coil replacement company developed relationships with literally thousands of customers and laid out the initial blueprint for success in the coil replacement business. Due to that success, you now have approximately (10) alternatives that have attempted to copy his model as it’s become obvious that this is a lucrative market. Even OEM’s have recognized that they need to have a piece of the replacement market. But an important point to remember is that just because a company says or even advertises that they are in the coil replacement business does not mean that they are any good or even fully understand how the replacement market operates. For example, most coil manufacturers today are still more interested in the production of larger quantities, so replacement coils are “special” to them. In other words, sometimes these manufacturers want to be in the coil replacement business, and other times, without telling you, they do not. And not knowing where a company’s focus or priorities lie makes it extremely difficult to work with them under emergency conditions.

Bob Jacobs was there at the beginning and is still quite active within Capital Coil. Having daily access to a resource that literally invented the coil replacement market is what separates Capital Coil from all other competitors. Capital Coil will continue to be your coil replacement experts, and we greatly look forward to the chance to work with you on future projects.

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In (3) days, Capital Coil & Air Manufactured and Delivered (4) Large Condenser Coils!!

A large HVAC contractor in South Florida recently contacted Capital Coil & Air with a request to modify an existing system of Carrier 38 Series Microchannel Coils with (4) large condenser coils on an emergency basis. The main goal was to change over from microchannel to standard copper tube/aluminum fin condenser coils. The one expressed requirement for this project was that this change needed to happen very quickly. See below for a summary and timeline of the project:

Condenser Coils
  1. Monday – The contractor reached out to Capital Coil & Air with the required information needed for new condenser coils.
  2. Tuesday – Capital Coil calculated the changeover from microchannel to standard coils for this retrofit. Capital Coil & Air then provided all of the necessary engineering and pricing data for the order. Included were all of the condenser coil drawings, ready for the customer’s approval, as well as all of the needed IOM’s (Installation, Operation & Maintenance Manual) for eventual installation.
  3. Wednesday – By Wednesday morning, the contractor approved the drawings and allowed the project to move forward. Construction on the coils began that afternoon. In less than 1.5 days, this job went from a brief phone discussion into full production!
  4. Friday – The coils were completed, crated and made ready to ship in less than 48 hours after production commenced. Capital Coil then contacted FedEx to ensure that the coils would be picked up that same Friday and overnighted to South Florida for Saturday delivery to the jobsite.
  5. Saturday – The contractor received the condenser coils and installation was completed that same weekend!

In all, the time from the original phone call to installation occurred in less than a week. Capital Coil takes great pride in our response times, as well as our ability to handle projects in emergency situations.

For various reasons, the HVAC industry has always required quick-shipments. Capital Coil’s 99% success rate with quick-shipments over the last 5+ years has us particularly well-suited to handle whatever situations may occur during the Covid-19 emergency. Please do not take any chances with “untested” manufacturers right now, and please consider Capital Coil for all of your quick-ship needs!!

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Differences Between Commercial & Industrial Coils??

The best performance you can get out of commercial coils is with copper tubes/aluminum fins. An extremely important fact to take into account is that when you change the materials of construction to an industrial coil, there’s always a drastic change in the performance. 

The explanation is really quite simple: when we build a stainless steel or 90/10 cupro-nickel coil, the materials don’t match up in terms of heat transfer to copper tubes/aluminum fins. So what does that mean? Using a chilled water coil as an example – you have a (4) row chilled water coil with copper tubes/aluminum fins, and you want to change to stainless steel. You will need to move to an (8) row coil to meet that same performance.                                                                                                                                                                          Commercial Coils

What conditions require these types of materials? The most common is with high pressure applications. Anything above 200 psig requires that you change construction materials from copper tube/aluminum fin to a special material that is able to work better under those conditions. The other instances are when you’re dealing with high temperatures or corrosive atmospheres. 

Capital Coil & Air manufactures and designs a wide assortment of heavy-duty industrial coils to withstand the environment of industrial applications.  Standard and custom designs are available for new and retrofit installations.  Our industrial coils are manufactured from quality materials that are heavier grades and thicknesses.  This ensures dependable performance and longevity, even under the most demanding conditions. While most manufacturers throw out astronomical prices or lead times that can better be explained as “months” rather than weeks, Capital Coil’s lead times are (4-5) weeks for cupro-nickel and (5) weeks for stainless steel.  

Whether it’s for boiler air preheating, pulp and paper drying process, lumber drying process, textile drying process, chemical heating process, Capital Coil & Air provides high quality industrial coils designed for easy maintenance and low operating costs.  With capabilities to build fluid coils for water, glycol, oil, and other liquids as well as refrigerant coils and steam coils for high pressures, we can easily meet all of your industrial coil requirements!

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Does Your HVAC Coil Selection Program Leave You With More Questions Than Answers?

At Capital Coil & Air, we have an accurate and user-friendly coil selection program to select and choose coils. Of course, making good selections is based on having years of experience working with coils of all types and sizes, and Coil Selection Programwe at Capital Coil have that necessary expertise.

When designing a coil, the object is to balance cost and performance together, and that is one area in which we can greatly assist. We do not always choose the cheapest coil because the cheapest coil in almost never the best coil. There are always pressure drops, materials of construction, performance requirements and a host of other things that all play into good or bad coil selections. These are even more relevant in the coil replacement market!

The object is not to duplicate a problem with a coil, but to instead solve the problem and make the coil perform better and last longer. This requires problem solving and making selections that are not always “in the box”.

Part of any successful selection process is having a good selection program to help you. But what makes a program good? First and foremost, you must get the correct results, or you have bad information that is also useless. But apart from that, the selection program must be easy to navigate through. There are “red lights” and “stop signs” built into the program to keep you from making bad selections. Our selection program has most, if not all, coil configurations and styles that you’re likely to run across. We are confident that you’ll find the selection program user-friendly, helpful, and one that makes you want to do business with Capital Coil & Air.

You simply have to click here to request the program, and we will send you an email in response with an activation code and a link to download the program. Of course we are always here to assist you in any selections that you make, or to give you some engineering suggestions and recommendations. Thanks for giving us the opportunity to help you!

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