Running Ductwork Through Floor Joist

As we look closer here s what we see in this house.

Running ductwork through floor joist. Rectangular ducts commonly used dimensions metric dimensions of commonly used rectangular air ducts in ventilation systems. Make sure the studs and bays line up well enough to leave a clear path. Viewed 2k times 0. 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.

This is preferable to running the lines under the joists and then covering them with a. Here are dome photos of the situation. Sometimes the best route for a flexible duct run is up and over an obstruction. Is that a towel in there.

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. As you can see the duct runs perpendicular and below the joist with one or two trusses thrown in. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. In my opinion there s no real load on it and making a hole through it should be okay.

I used a 6 hole saw to run a new duct into an addition we built. From what i can see there are no joists attached to it. I understand that the maximum size hole i can put through a 9 floor joist is 3. But if i add a 5 booster fan would it be possible to retain proper air flow and route this duct through the joist.

Spiral ducts dimensions standard dimensions of spiral ducts imperial units. Position bathroom vent fans so the ducts can run parallel to the joists right up to where they exit the house. 2 grade of douglas fir and maximum span floor joists imperial units. I would like to continue them in the same direction because those areas they go to will still need hvac but raise them and go through the joists in a narrower duct if need be.

What the installer did here was to screw a piece of sheet metal to the bottom of the joists and attach a duct to it to carry the air back to the hvac system. In this case it s big enough that there s even a joist running right through the middle. Ducts should be able to run between studs in the wall and then turn into a joist bay the space between two joists. Yes you can bore relatively large holes through i joists to run refrigerant lines pipes and ducts.

If you can t tell and aren t sure of your own judgement have a framing carpenter take a look. 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. Finally if all else fails drop your pipes and ducts down below the joists and box them in with wood framed. Is it possible to run an hvac duct through a floor joist.

Maximum floor joist span no.