Air Ducts Between Floors

When the work is completed install a 14 in.

Air ducts between floors.

This article describes heating and air conditioning ducts that have been placed in or beneath concrete floor slabs. Functional troubles such as lack of air flow or collapsed ductwork and environmental problems such as. Section r403 2 1 insulation prescriptive. If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on a wall.

The opposite is true for ceiling ducts which should be placed as far away from windows as possible so that heat warms the room and not the window. One of the upstairs closets has a hatch in the floor that lets us look in between the lower ceiling and the upper floor. This pulls the air across your body. Section m1601 1 1 above ground duct systems.

Stud wall cavities and spaces between solid floor joists cannot be used as supply air plenums. Floor ducts placed below a window give better results. We ve recently had a slight moldy smell and water on the 1st floor ceiling. This size fits just between most floor joists.

It turns out that the air conditioning ducts in that space are covered in condensation which is. Building framing cavities cannot be used as supply ducts or plenums. Hvac ductwork in floor slabs. Return air ducts usually use ceiling joist spaces as the actual duct which then runs back toward the furnace.

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 in the floor then the return air should be located up high. The most common size duct used is 14 in. Hvac air ducts located inside concrete slab floors invite a surprisingly broad range of building problems that fall into two broad categories.

Without a return air duct the air would not properly circulate and your energy costs would rise. Section r403 2 3 building cavities mandatory. Area through this access hole. We have a 2 floor house built in 1978 in the dc area which is hot and very humid in the summer.

Most installers report they can get to a 100 sq.