Attic Return Air Duct

At 21c i d guess you have a lot of leaks on the return side.

Attic return air duct.

Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Install the square return air duct perpendicular to the joists. To maintain balanced air pressure and air movement your duct system needs return vents for air in the room to be pulled back into the hvac system. This pulls the air across your body.

Installing ducts in a multistory home goes more slowly since wall stacks are included. Return ducts in my attic. A return air temp b outside air temp c airflow across evaporator coil d return air leaks from attic if you measure supply and return temperatures at the grille and at the air handler you can get an good idea of where your biggest losses are occurring. A return duct is the part of the system that carries the air back to the furnace or air handler where it will then be circulated back out through the supply vents.

Cut holes in the top of the return air duct to match the holes in the panning. Not providing enough returns is a common ductwork design flaw that leads to comfort complaints. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. I have a couple questions.

There are manufacturers that advertise insulating panning sheet products that aid in this practice. If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on. These ducts typically start with vent grates in the wall on the ceiling or in the floor. The illustration above shows a floor joist cavity used as a return air duct by nailing material such as gypsum board sheet metal foil insulation or osb to the bottom of the floor joists.

Installing ductwork is a 1 4 day job because of the wide range of scenarios. Here s a typical scenario for a 2 000 2 500 square foot two story. You want to run it so it covers up all the holes you cut in the panning. However using panned floor joists as an hvac air.

My 1948 ranch house has supply ducts in the crawlspace return ducts in the attic. I ve replaced the supply ducts and have insulated and encapsulated my crawlspace according to the best methods presented on this site. If the supply ducts are in the floor then the return air should be located up high. This allows the air to get into the return air duct.

I ve read a bunch of articles here and on bsc s site concerning ducts in the attic. Ted also has inherited a powered attic ventilator. An air return duct is basically a concealed air passageway in a home or other building that acts as a channel for pumping air out of an enclosed room and into the air conditioning or central heating system. The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago.

6 tips for good ductwork design.