Air Ducts Between Floors

Hvac air ducts located inside concrete slab floors invite a surprisingly broad range of building problems that fall into two broad categories.

Air ducts between floors.

A return air duct is what carries air back to the furnace after it is dispensed throughout the home through the supply duct. The warm air will offset any cold air entering around the window and reduce condensation or frost on the window. If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on a wall. Free call from tim carter about your ducts click or tap here.

Stud wall cavities and spaces between solid floor joists cannot be used as supply air plenums. Section r403 2 3 building cavities mandatory. When the work is completed install a 14 in. The most common size duct used is 14 in.

Floor ducts placed below a window give better results. Area through this access hole. Building framing cavities cannot be used as supply ducts or plenums. This pulls the air across your body.

We ve recently had a slight moldy smell and water on the 1st floor ceiling. Section r403 2 1 insulation prescriptive. We have a 2 floor house built in 1978 in the dc area which is hot and very humid in the summer. Return air grille with a piece of sheet metal attached to the back of the grille that has been painted flat black.

If the supply ducts are in the floor then the return air should be located up high. Hvac ductwork in floor slabs. One of the upstairs closets has a hatch in the floor that lets us look in between the lower ceiling and the upper floor. Return air ducts usually use ceiling joist spaces as the actual duct which then runs back toward the furnace.

This size fits just between most floor joists. Without a return air duct the air would not properly circulate and your energy costs would rise. Most installers report they can get to a 100 sq. Section m1601 1 1 above ground duct systems.

Functional troubles such as lack of air flow or collapsed ductwork and environmental problems such as.