Air Ducts Between Floors

Building framing cavities cannot be used as supply ducts or plenums.

Air ducts between floors.

Area through this access hole. Section m1601 1 1 above ground duct systems. This article describes heating and air conditioning ducts that have been placed in or beneath concrete floor slabs. If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on a wall.

Hvac ductwork in floor slabs. Floor ducts placed below a window give better results. 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.

One of the upstairs closets has a hatch in the floor that lets us look in between the lower ceiling and the upper floor. The warm air will offset any cold air entering around the window and reduce condensation or frost on the window. Section r403 2 1 insulation prescriptive. It turns out that the air conditioning ducts in that space are covered in condensation which is.

We have a 2 floor house built in 1978 in the dc area which is hot and very humid in the summer. Without a return air duct the air would not properly circulate and your energy costs would rise. Free call from tim carter about your ducts click or tap here. Most installers report they can get to a 100 sq.

When the work is completed install a 14 in. Stud wall cavities and spaces between solid floor joists cannot be used as supply air plenums. We ve recently had a slight moldy smell and water on the 1st floor ceiling. The most common size duct used is 14 in.

This pulls the air across your body. Hvac air ducts located inside concrete slab floors invite a surprisingly broad range of building problems that fall into two broad categories. Functional troubles such as lack of air flow or collapsed ductwork and environmental problems such as. This size fits just between most floor joists.

Section r403 2 3 building cavities mandatory.