Is Duct Board Dangerous for my HVAC System?

Is duct board dangerous for your HVAC system? Fibrous glass duct insualtion is used for thermal insulation of the air going into the air plenum for your duct system. People are being told by HVAC salesmen and HVAC technicians that duct board makes for dangerous ducts. They say it’s because the fibers fall off and enter the air stream. I wanted to go over this topic. I have talked to the professionals at Johns Manville. I had an in depth conversation with them at the AHR convention in 2022.

They are the experts when it comes to fibrous glass insulation. They said duct board insulation is manufactured to NAIMA standards. The following groups also have standards and recommendations for the installation of them as well as the safety of the product.
ASHRAE – American Society of Heating, Refrigeration, and Air-Conditioning Engineers
ASTM – American Society for Testing and Materials
EPA – Environmental Protection Agency
NFPA – National Fire protection Agency
SMACNA – Sheet Metal & Air Conditioning Contractors’ National Association
ICC – International Code Council, Inc.
AIA – American Institute of Architects
AIHA – American Industrial Hygiene Association
AMA – American Medical Association

We don’t install fibrous duct board, but I also don’t have a problem with existing homes that have it as part of their HVAC ductwork. It’s even in my own house, and I feel totally comfortable with it.

Please help our channel produce more quality content for those interested in our industry.

Please visit our website @

If you’d like to book an appointment with Fox Family Heating and Air in Sacramento, El Dorado, or Placer County, CA

Visit us on our social media pages:
Facebook @
Twitter @
LinkedIn @



Converting my A/C into a HEAT PUMP! [Adding TXV, RV & re-pipe]

This is my upstairs A/C that I replaced last spring with a 3 phase straight cool condenser (because it was free) that I hacked the VFD into. It ran just fine all simmer long and I had originally planned on doing the heat pump modification once the summer ended. Well, it’s Jan 6th and I’m…

Read More

Bronx Heating Contractors Directory of the top heating contractors in the Bronx, New York region. Get a free listing today! Source

Read More

AC cleaning service in Dubai – AC duct cleaning service Dubai

#1 Since 2009, we now have served more than 8000 clients and serviced more than 45,000 AC units. Call for FREE Inspection – Dubai: 04 3215505 / Abu Dhabi 02 6723820 We only use 100% eco-friendly chemical-free disinfectant. Saniservice provides Deep Cleaning Services in Dubai. fill-up the form and book A Free Inspection. AC cleaning…

Read More