Take insulated flexible duct for example. Products like Johns Manville Flex-Glas PC are already formulated for optimal thermal and acoustical performance, so they don’t need to be installed with more ...

In many high-end new-build projects, ductwork is routinely insulated to help minimize energy loss as conditioned air travels from the HVAC units through the ductwork. But duct insulation is being used ...

For more information on combustion air supply ducts and purchasing a furnace or air conditioner, contact the Minnesota Energy Office at 651-296-5175 or 1-800-657-3710.

These flexible, insulated feeder ducts are only 2 inches to 3 inches in inner diameter. In diameter, and air moves through them at about 1,500 feet per minute (fpm) compared with 500 fpm to 600 ...