Air Ducts Between Floors

One of the upstairs closets has a hatch in the floor that lets us look in between the lower ceiling and the upper floor.

Air ducts between floors. We ve recently had a slight moldy smell and water on the 1st floor ceiling. Hvac ductwork in floor slabs. Area through this access hole. If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on a wall.

Hvac air ducts located inside concrete slab floors invite a surprisingly broad range of building problems that fall into two broad categories. When the work is completed install a 14 in. Section r403 2 3 building cavities mandatory. Stud wall cavities and spaces between solid floor joists cannot be used as supply air plenums.

Without a return air duct the air would not properly circulate and your energy costs would rise. This article describes heating and air conditioning ducts that have been placed in or beneath concrete floor slabs. This size fits just between most floor joists. Section r403 2 1 insulation prescriptive.

Return air ducts usually use ceiling joist spaces as the actual duct which then runs back toward the furnace. This pulls the air across your body. 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.

It turns out that the air conditioning ducts in that space are covered in condensation which is. Floor ducts placed below a window give better results. Section m1601 1 1 above ground duct systems. Most installers report they can get to a 100 sq.

The warm air will offset any cold air entering around the window and reduce condensation or frost on the window. Free call from tim carter about your ducts click or tap here. 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. The most common size duct used is 14 in.

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