Hvac Ducts Between Floors

It turns out that the air conditioning ducts in that space are covered in condensation which is dripping down onto the drywall and wood below.

Hvac ducts between floors.

The third shows ducts between conditioned floors in a multi story house. This size fits just between most floor joists. The fourth shows them in the attic sort of but below the building enclosure with some help from a special type of truss. Add a false return grille cut an access hole in the ceiling of the first floor in a central area to gain access to the ducts.

Occasionally we need to access the ducts between the floors to improve the airflow. Install return ducts to the ceiling of each room upstairs and keep the upstairs doors closed. Heat entering through ceiling ducts however naturally tends to accumulate at the ceiling warming the room from top to bottom more slowly than floor ducts. Hvac air ducts located inside concrete slab floors invite a surprisingly broad range of building problems that fall into two broad categories.

Not enough height to tie a big duct into. I ve got room for 12 diameter between webs in most places but that only allows for 9 flex with. According to the natural laws of convection heated air entering through floor ducts rises. The most common size duct used is 14 in.

Despite using 18 floor trusses i am having trouble making room for all the ductwork between floors. Now the air that is delivered upstairs will have to fill the room and enter the return duct rather than sliding down the stairs. You can install ceiling boots and run flex to the return trunk in the attic. Functional troubles such as lack of air flow or collapsed ductwork and environmental problems such as radon odors flooding mold insects and where transite cement asbestos ductwork was used asbestos particle contamination.

One of the upstairs closets has a hatch in the floor that lets us look in between the lower ceiling and the upper floor. Floor ducts for heating. Panned joist return ducts are almost always terribly leaky. This disperses warmth evenly throughout the room from floor to ceiling.

Another method which isn t shown in that paper from nrel is to put the ducts in a conditioned crawl space as shown above. The chases are only 13 5 high because trusses have doubled bottom plates so that leaves me 10 5 interior height for ductboard plenums dist.