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Old 12-10-2009, 07:33 AM   #1
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range hood venting


curious as to correct way to insulate and terimnate range hood vent through roof?

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Old 12-10-2009, 08:00 AM   #2
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range hood venting


Wrap insulation blanket around the duct work in the attic space after taping all seams with metal duct tape. Use a covered roof vent cap on the 6" duct exiting the roof. Use a roof boot on the roof.

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Old 12-10-2009, 08:02 AM   #3
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range hood venting


do they make ones that don't allow backdraft?
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Old 12-10-2009, 08:10 AM   #4
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range hood venting


use an inline damper for this, not the roof cap. The cap should have an insect screen also.
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Old 12-10-2009, 10:09 AM   #5
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range hood venting


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Originally Posted by Bob Mariani View Post
use an inline damper for this, not the roof cap. The cap should have an insect screen also.
Yup, a damper required by M1502.1: "Range hoods shall discharge to the outdoors through a single-wall duct. The duct serving the hood shall have a smooth interior surface, shall be air tight and shall be equipped with a backdraft damper...."
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Old 12-10-2009, 11:37 AM   #6
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range hood venting


I would insulate with more than the R-7 required by some codes. The idea is to stop condensation and grease from depositing on the pipe insides. You want the pipe as warm as possible. I would use a roof cap damper w. screen rather than an in-line damper that lets cold air in the rest of the pipe when the unit is not being used. The attic temperature will help temper the pipe a little more, to stop condensation if the pipe was warmer than the outside air. And..... Welcome to the forum!
Be safe, Gary

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