Installing a vent hood and would like to know about cold weather install
I'm installing a vent hood over our cooktop and the instuctions mention putting a thermal break in the line. I've done a search and can't find anyone selling thermal breaks for 8 inch duct. What can I use as a thermal break in an 8 inch round duct going up through the roof ? The damper has to be installed on the cold side of the thermal break.