Attic Duct Return Installation

Use metal flex or fiber board ducts that are insulated to code.

Attic duct return installation.

I have a couple questions. As difficult to achieve as getting hvac companies to actually train their workers how to install ducts. Cut holes in the top of the return air duct to match the holes in the panning. Hard ducts without proper mooring will be unbalanced and unbalanced ductwork might be to blame for a number of hvac problems.

I ve replaced the supply ducts and have insulated and encapsulated my crawlspace according to the best methods presented on this site. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. You want to run it so it covers up all the holes you cut in the panning. So that duct was sucking in attic air and sending it to the house.

Here the two liners weren t even touching. 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. Install the square return air duct perpendicular to the joists. 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.

At least with the other one they had two inches of overlap. When installed in this fashion it will allow the system to suck the air throughout the entire room. This allows the air to get into the return air duct. This pulls the air across your body.

Supply air from furnaces and air conditioners should be on outside walls. Give your ducts the proper support. He d add open cell foam below the roof deck to give the assembly the required r value but the bids range from 40 000 to 60 000. I ve read a bunch of articles here and on bsc s site concerning ducts in the attic.

Improperly supported flex. The tape on the duct liner wasn t sealed. 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. 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.

The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. And this is just one of the reasons that the return ducts need to be installed directly across from the supply vents. If testing of ducts returns was code this would be a step in the right direction. Return ducts in my attic.

The flex duct liner inside wasn t connected. The duct insulation should include a vapor barrier cover. The photo here shows one in a return duct.