Vent hood -- placement of backdraft damper

attofaradApril 29, 2012

I'm installing a Broan hood with a rooftop blower. The blower has a backdraft damper on its output, but Broan still indicates in the spec/instructions that one should be added inline.

The most convenient place for the damper would be immediately attached to the hood. For one thing, I could verify operation (and change spring if necessary, adjust, lube) by removing the hood baffles for direct access. The only reason I can think of for not putting it there would be if the flappers would result in more air turbulence noise if placed on the hood exit than if placed a bit further up the path.

Any experience with this?

Thank you for reporting this comment. Undo
Fortinbras

Bump.

We just installed a custom hood with Broan PIK 45 and EB 15 external 1500 cfm blower. There clearly is still a bit of a draft. I'm going to talk to our contractor / HVAC guys tomorrow about installing this back-draft gizmo.

Any input or comments appreciated.

Will post updates.

    Bookmark   April 29, 2012 at 7:30PM
Thank you for reporting this comment. Undo
kaseki

attofarad:

My hood has a damper just above it supplemental to the one on the output side of the roof fan. I don't think the hood damper adds significant noise, but a comparison test would be extremely inconvenient.

In any case, differential pressures due to wind gusts will cause some damper opening, so a pair of dampers provides additional resistance to air infiltration down the duct.

kas

    Bookmark   April 29, 2012 at 9:15PM
Thank you for reporting this comment. Undo
attofarad

Thanks Kas, I will just add it right to the hood port.

Gary

    Bookmark   April 30, 2012 at 4:17AM
Sign Up to comment
More Discussions
Magnetic SS Refrigerator
My wife and I keep going back and forth on the issue...
greasetrap
Difference between advantium and convection microwave
I had almost decided on the ge advantium (monogram)...
athensmomof3
Bluestar platinum vs Capital Culinarian
We are deciding on kitchen appliances for our upgrade...
malba2366
Refrigerator - Fisher Paykel, Blomberg, Summit...?
I am looking for a counter-depth refrigerator no more...
virtualanne
Fhiaba column refrigerator freezer anyone?
Has anyone seen these in person or have in their kitchen?...
Dietitian
Sponsored Products
Malibu 36" Single Bathroom Vanity Set by Wyndham Collection - Espresso Finish wi
Modern Bathroom
The Perfect Shade Creator 12-ft. Awning Hood and Side Covers - RGLHOOD12-W
$429.91 | Hayneedle
Fischer Mobel | Aluline Umbrella
YLiving.com
SBF 80 G6 Super Quiet Ventilation Fan
Lightology
Blendtec Blender
$499.95 | FRONTGATE
Replacement Filter for 30" Arezzo Series Range Hood
Signature Hardware
Leila Gold and Bronze Double Multi Light Pendant
Lamps Plus
District Bronze One-Light Outdoor Wall Light
$199.00 | Bellacor
© 2015 Houzz Inc. Houzz® The new way to design your home™