Should sealants and encapsulants be used on HVAC duct systems?

Sealants and encapsulants that coat and seal duct surfaces are intended to prevent the release of dust and dirt particles into the airstream. However, little documentation exists on the effectiveness of these materials. Questions remain about whether the sealant materials deteriorate over time, whether or not they alter the surface burning characteristics or acoustic properties of the insulation, and about the potential toxicity of the products should they catch fire.

- Can heating and cooling equipment be downsized with properly insulated ducts? Plant engineers often oversize HVAC equipment just to be safe. However, in a retrofit, a properly insulated and maintained duct system may enable a plant engineer to reduce the size of the previously specified equipment.

- What is the difference between rotary and textile fiber glass insulation? The two most common processes used in manufacturing fiber glass insulation are rotary and textile. They show a nominal difference in performance ... more.

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