Dave shows us how to add a hvac return air duct vent.
Hvac floor returns.
The return vent is usually bigger than your supply vents because it s how the air handler sucks air into the hvac system.
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The excess air needs somewhere to go and that spot is the return vent.
By getting down on the floor and putting your face up against it you can see through into the bedroom but you get a limited narrow view of the other side.
An hvac return air can be in the floor but they work much better on walls up about 7 feet.
And in slab ducts also invite flooding mold insects and where transite cement asbestos ductwork was used asbestos particle contamination or collapsed ductwork.
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Closing or blocking vents wont decrease your energy use since the hvac system always runs at the same speed.
If the pressure in the bedroom with the door closed and the air handler running is higher than 3 pa this is a great way to retrofit a return air pathway.
Using floor joists as return ducts by panning can cause leakage because negative pressure in the cavity will draw air from the outside into the cavity through the construction joints of the rim area at the end of the joist cavity.
In other words there should be an equal amount of air entering and leaving your hvac system.
Your return and supply ducts are supposed to maintain a balanced air supply.
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Your return vents are responsible for air pressure when your hvac system blows air into your home that changes the air pressure inside.
Hvac return air ducts located inside concrete slab floors may have collapsed.
The return air ducts help pull the air as it is being pushed.
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The best use of the perfect balance is in existing homes where you don t have returns in the bedrooms and can t or don t want to install jumper ducts or transfer grilles.
Still commonly used is the panned floor joist.
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He shows us how to measure the location cut the dry wall and install the vent.