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I’m caught in the middle of a project with winter hitting sooner than expected. I’m putting in a 6” range hood with a 45 on it in the attack. My plan is to run it 20 Feet into another 45 that will connect to an old 4” pvc bathroom vent the is 4ft out. Doing this until April being the weather is snow and get below -30 in the winter.

Second option is to bring the 6” duct to a square duct in the wall and running it down 7ft to the Old 6” down-vent that runs anther 4ft to outside.

I will take any advise, even if I have to go with larger cfm range.

Joshua King
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If feasible, you should consider second fan.

That would be mounted on exterior.

The combination of the two fans might give you cfm that you need at the range.

Ruskes
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7 ft. + 4 ft is 11 feet leading to a full-sized exhaust. Hopefully all metal since it was a kitchen vent before.

24 feet to an undersized exhaust which is plastic and therefore not to code for kitchen exhaust (which has to be metallic, due to potential grease fires inside the duct) is clearly inferior, not to mention a code violation and fire hazard.

Ecnerwal
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  • First thank you for your time. So going from a hood vent down into the wall with square duct 7ft and connecting to the old metal 6in that extends another 4ft, 11ft total with 4 elbows. Will or won’t work? – Joshua King Nov 21 '22 at 16:45
  • If you keep *all* the duct metal, it should work and not be a code violation. It will certainly work better for any given fan than running 24 feet, part of it 4" and code-violating plastic. Whether it will work *as well as you want it to* depends on the unspecified fan's performance. – Ecnerwal Nov 21 '22 at 16:53