How To Seal Air Handler Plenum In Attic

If an air handler is in a garage attic crawlspace or closet it might experience less air flow and humid air.

How to seal air handler plenum in attic. And plenum and return air connectors. Humid air and air flow. My mother has had me going up into her attic to seal the leaky ducts and parts of the plenum air handler that join up to the furnace and coil units. Common places to find them are at ill fitting cover panels or those with missing screws.

Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11. Because the plenum is where the greatest air pressure differential is found it is therefore the 1 place to seal to save energy and cash. The entrance of the attached air filter insertion point base. Anyhow the return box and the other box that has the ducts coming out of it are made of sheet metal.

Where air conditioning pipes enter the housing grommets may be missing or leaky. Hot humid air mixes with the cold internal air of the air handler by the cold metal of the unit causing condensation. Leaks in hvac air handlers can usually be seen felt and heard. This is a common occurrence in florida garages.