Narrow Duct Work Across Floor Joists

Think about it for awhile.

Narrow duct work across floor joists. The rim joist fig. You can pull the luan out after you get your major runs in. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. Cut a piece of 1 4 luan 8 long and a little less than the chase width.

Not certain if the floor above is carpet or wood carpet would be easier to patch. You may be able to work with a wide shallow duct so you can have a broad not too deep soffit for the cross joist duct run. Department of energy below. Slide it in first and then slide the duct on top of it.

Any chance of just moving that heat register in the floor over to the next adjacent joist cavity. That takes a lot of the headache out of bumping 5 sections of duct across the bottom cord of the trusses and dinging it all up. Use sheet metal duct elbows to work around bends and tin snips to cut the ductwork for a precise fit. I understand that the maximum size hole i can put through a 9 floor joist is 3.

Only approved duct materials such as galvanized steel aluminum fiberglass duct board and flexible duct that meet local code smoke and flame spread criteria must be used. If air can move through the insulation then where does that leave the insulation. I came across this because of a run out that was loosing 40 of its temperature split even though it was deeply buried in insulation. Patching the hole in the main duct branch is simple.

Inside the ducts the pressures and velocities of air are very high. To prevent problems use saddles or straps to support at regular intervals 4c 4d follow the manufacturer s instructions but in case they get lost here is a list of best practices for. This would raise the ductwork 1 2 to 1. But if i add a 5 booster fan would it be possible to retain proper air flow and route this duct through the joist.

Local codes require no less than 7. Attach ductwork that branches off and approaches each vent or register in the house. B the framing member that runs around the perimeter of your house and that the floor joists butt into often gets riddled with large holes this space is the logical exit point for dryer and furnace vents big electrical service wires and fireplace fresh air intakes. Cutting a hole in the floor and the tapping into the main duct branch really isn t that hard.

Floor joist cavities can make acceptable duct chases for insulated air sealed metal flex or fiberboard ducts. See the illustration by the u s. Just be sure to get the sizing sorted out correctly ie a 12x12 duct cannot be replaced by a 3x48 duct same area as there s a lot more friction in the 3x48 but the correction factors for duct shape are surely. I am remodeling my basement and have a ceiling clearance issue.