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-   -   range hood venting (http://www.diychatroom.com/f19/range-hood-venting-58942/)

interested 12-10-2009 06:33 AM

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

Bob Mariani 12-10-2009 07:00 AM

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.

interested 12-10-2009 07:02 AM

do they make ones that don't allow backdraft?

Bob Mariani 12-10-2009 07:10 AM

use an inline damper for this, not the roof cap. The cap should have an insect screen also.

Michael Thomas 12-10-2009 09:09 AM

Damper required in range exhaust hood
 
Quote:

Originally Posted by Bob Mariani (Post 364424)
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...."

Gary in WA 12-10-2009 10:37 AM

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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