Will this ductwork for my range hood work?
Home Improvement Asked by jcwkjw20170 on March 29, 2021
I installed a new exterior wall vent and ran 6" round galvanized steel duct work through my ceiling joists to the spot where our new range hood will be.
There was a significant amount of PEX plumbing that I couldn’t move anymore, so I put a 90 degree bend and brought down the duct through the cavity.
Question: Will there be any issue having the wall behind that vent pipe un-drywalled and exposed like it is?
The range hood will cover that spot, but the duct pipe is closely hugging the wall and wasn’t sure if that would pose any major problems.
One Answer
One way to resolve this is to transition from 6” to 5” duct in ceiling space. Dropping below ceiling with 5” duct will give you another 1/2” clearance from the wall.
The reduced size duct on a short run from blower to ceiling probably has a minor impact on airflow. 6” duct is rated for up to 600 cfm. If your blower is pushing 400-500 there is no significant impact to airflow. If it is pushing 600 or more there will be a bit of extra noise. If it is well over 600cfm your duct is too small .
Answered by Kris on March 29, 2021
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