Attic Duct Return Installation

The photo here shows one in a return duct.

Attic duct return installation.

When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. I ve replaced the supply ducts and have insulated and encapsulated my crawlspace according to the best methods presented on this site. The duct insulation should include a vapor barrier cover. Install the square return air duct perpendicular to the joists.

So that duct was sucking in attic air and sending it to the house. The ducts are installed strategically in these locations to help battle this heat loss or heat gain. It comes down to three options the first of which is to convert his attic into a conditioned space by installing 4 1 2 inches of polyiso insulation above the roof deck and then adding a new standing seam metal roof. The flex duct liner inside wasn t connected.

You want to run it so it covers up all the holes you cut in the panning. When installed in this fashion it will allow the system to suck the air throughout the entire room. And this is just one of the reasons that the return ducts need to be installed directly across from the supply vents. Give your ducts the proper support.

As difficult to achieve as getting hvac companies to actually train their workers how to install ducts. Supply air from furnaces and air conditioners should be on outside walls. My 1948 ranch house has supply ducts in the crawlspace return ducts in the attic. Return ducts in my attic.

This is an especially relevant tip for flex ducts more on that in a minute but you need to make sure any ducts in your attic have proper support. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. At least with the other one they had two inches of overlap. If the supply ducts are in the floor then the return air should be located up high.

If testing of ducts returns was code this would be a step in the right direction. Here the two liners weren t even touching. Hard ducts without proper mooring will be unbalanced and unbalanced ductwork might be to blame for a number of hvac problems. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

This pulls the air across your body. I have a couple questions. Improperly supported flex. I ve read a bunch of articles here and on bsc s site concerning ducts in the attic.

This allows the air to get into the return air duct. The tape on the duct liner wasn t sealed. Next areas to address are oversized supply box pentrations supply boxes that lift off the attic floor when supply grill is installed and return air leakage.