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Tool Talk Discussion Forum

Need for damper in range hood duct

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Stan in Oly, WA

10-21-2007 14:28:24




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I installed a new range hood on Friday and will finish ducting it tomorrow. The replacement hood came with a 3"X10" baffle that could be installed inline if that was the size of the adaptor you used to take it to 4" round. The hood I replaced was ducted with a 7" to 4" reducer at the hood, so there was a >7" hole in the bottom of the overhead cabinet already. The replacement hood provided a knockout for that option, but no 7" inline baffle. I imagine that 7" baffles are readily available and probably not expensive, but I started wondering whether they actually did more good than harm. A screen on the duct cap on the roof already keeps out most pests, so the baffle must be for the purpose of preventing gusts of wind from blowing down the duct. The downside would seem to be that blowing the baffle open uses up some of the force of the exhaust, and this situation would get worse as the baffle got heavier with accumulated grease. If any housekeepers are so fastidious that they occasionally take apart their range hood ductwork to clean grease out of it, I can assure you that they don't live here.

Any advice on the value of having a baffle in place?

Thanks, Stan

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Slowpoke

10-25-2007 01:03:18




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 Re: Need for damper in range hood duct in reply to Stan in Oly, WA, 10-21-2007 14:28:24  
My electric counter top unit has a range hood with a grease screen and a manually operated fan intergral with the hood. The exhaust is thru a 7" duct to the roof. About 16" up from the fan is a damper with two semi-circular flaps that open upward when the vent fan is on. The damper was replaced several years ago because one of the flaps had a broken hinge pin. The damper fits between two sections of ductwork and only added an inch or so to the duct length. If the grease screen is kept clean, the damper won't become laden with grease. Under very gusty wind conditions, the damper flaps will open due to the vacuum created by the wind at the duct opening at the roof. Normally it keeps heat from escaping up the vent.

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T_Bone

10-21-2007 15:26:33




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 Re: Need for damper in range hood duct in reply to Stan in Oly, WA, 10-21-2007 14:28:24  
Hi Stan,

Dampers are for controling air flow, screens on the vent caps are for keeping rodents out.

Most codes don't allow for dampers in a exhaust hood as this is for venting combustion-by-products as that would be a heavy dose of carbon monoxide when the unit was off.

Heatloss is minimal.

I persoanly don't think there's one added benefit to having a damper in any exhaust hood.

T_Bone

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Gary from Muleshoe

10-21-2007 15:24:59




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 Re: Need for damper in range hood duct in reply to Stan in Oly, WA, 10-21-2007 14:28:24  
Flashback is correct, the baffle is only used when it is not vented out side.



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flashback

10-21-2007 14:51:54




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 Re: Need for damper in range hood duct in reply to Stan in Oly, WA, 10-21-2007 14:28:24  
If I remember right, that baffle is to be used when no vent is installed. It allows the air to pass through the filter and return to room. As far as heat , that will be nil to nothing as the filter offer resistance and require a fan to be used to extract the air out to the vent. Fireplaces are the real culprits.



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Bob

10-21-2007 14:32:42




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 Re: Need for damper in range hood duct in reply to Stan in Oly, WA, 10-21-2007 14:28:24  
Are you in an area where the house has to be heated?

If so, without a damper, the duct will act as a chimney (warm air rises) and continuously vent warm $$$ room air to the outside.



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