Technical Corner: The Value of Coating HVAC Insulation

Most air conditioning systems built over the last thirty years have air distribution pathways, or ducts, lined with fiberglass insulation. Unfortunately, insulation absorbs dirt and other matter, including microbial spores, greases and even oils. These particles penetrate the insulation, becoming entrapped and inaccessible for removal.

Due to particle entrapment, it is common for insulation to get dirty, and downright nasty in some cases. Even a slight bang on the duct work or unit sidewalls could send a cloud of dust and other matter into occupied areas. Listed below are a few of the problems commonly experienced:

1. Mold entering through the air stream is responsible for most objectionable odors encountered in systems. Entrapped mold spores eventually grow, due to the presence of humidity and nutrients within the insulation, causing undesirable consequences for building owners.

2. Organics, such as oil, can enter duct work if an air handler is located near a truck loading dock. The incoming air from around the dock usually contains diesel exhaust and other fumes. Some of these particulates, or fumes, may become lodged within the porous insulation, eventually becoming a source of odors.

3. Over the years fiberglass may lose its integrity. This results in small fiberglass particles being released into the air stream. In some cases, building owners can actually see black specs on desktops, which are later identified as being fiberglass particles.

Because of these problems HVAC contractors and NADCA duct cleaners often recommend cleaning and coating the duct work and insulation. As stated above, uncoated fiberglass insulation contains dirt and other matter that cannot be successfully cleaned. However, coated duct work is smooth and easily cleaned just by wiping the surface of the material. Additionally, sealing ducts with a coating eliminates the release of fiberglass emissions into the airstream.

Purchasing and recommending coatings can go a long way towards protecting your, or your customer’s investment, significantly reducing odors and emissions into occupied areas. For most building owners and contactors alike, it’s a win-win situation.

Lynn Burkhart is the founder and president of Controlled Release Technologies, Inc. located in Shelby, North Carolina. More information about the company, and its products, can be found at and by calling (800) 766-9057.

Controlled Release Technologies Launches New Website

Our goal at CRT is to continually provide education-based service and innovative solutions to problems encountered in the HVAC industry. The perfect example of this is our recently launched website.

Found at, our website allows visitors to quickly and conviently learn the cause behind problems they have encountered.

The vision of our president was to create a user-friendly website that could be easily understood by contractors, engineers, and managers. The goal is to push the problem buttons encountered throughout the industry, and used current, proven industry data to inform visitors that solutions do exist.”

To make this design a reality, we hired Don Grothoff, a seasoned web marketing consultant. With 15 years experience in web design, and 14 years in sales and marketing, Grothoff has built and marketed hundreds of websites for small to medium sized businesses across the U.S..

In addition to, we launched a blog site at, created a YouTube channel with problem podcasts and product application videos, and developed both Facebook and Linked In business profiles. All this was done to provide visitors with quality information and instant search results.

It is important that our company remain a living, breathing entity on the internet. Not only do we need to remain aprised of current news and trends, but now through social media, we can to reach out more to current and potential customers.

Jonathan Dunagin, is the Marketing Director of Controlled Release Technologies, Inc., a research, development and manufacturing firm based in Shelby, North Carolina. CRT is an EnergyStar Partner and manufacturer of independently-certified Green products for HVAC maintenance. Since 1986, CRT has been creating leading edge HVAC maintenance products that have become industry standards, used in thousands of commercial buildings world-wide. CRT employees are members of BOMA, ASHRAE, ASHE and the American Chemical Society. (800) 766-9057.