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jpc 07-14-2012 10:54 AM

Question about my exhaust vent over stove
Hello all, I hope I'm posting this in the right place, and thank you in advance. A week or so ago during that stretch when we had the really hot temp's, I was leaning against the stove and felt warm humid air coming from the stove's ventilation fan, I turned the fan on low and have left it on since. This past winter I spent a bunch of time air sealing and weatherizing the house and didn't find anything then, so I'm assuming this is something recent. Can anybody tell me what may be causing this, or what I should check or do. Any advice or input is greatly appreciated. Thank you

O just in case it matter's, I'm in virginia, The house is 1 level with room above the attached garage. The stove and hood are against the common wall with the garage

Windows on Wash 07-14-2012 12:04 PM

By fan do you mean the air circulation fan (i.e. heat exchanger) or something else?

joecaption 07-14-2012 12:08 PM

There was suppost to be a flapper that acts like a check valve to not let outside air or insects in someplace. Could be built into the vent or where it exits the outside.

jpc 07-14-2012 12:16 PM

"Windowsonwash" Im sorry I meant the small exhaust fan built into the hood above the stove. Being that It's a fairly new issue , think maybe it is stuck in the open position? Looking from outside, It looks like white pvc pipe with some sort of cap on it sticking straight up out of the roof, I'll get up there and take a closer look,and let ya know what I see.
Thanks for responding guys

Windows on Wash 07-14-2012 12:22 PM

May not have a damper on it. If it doesn't, you can put one in and it will help with the draft.

joecaption 07-14-2012 12:23 PM

That PVC your seeing is far more likly to be a vent for the sewer gases.

Daniel Holzman 07-14-2012 01:23 PM

Kitchen hood exhaust fans typically exhaust into galvanized steel pipe, often 4 or 6 inches in diameter, or occasionally into flexible pipe. The pipe is typically run horizontally to an exhaust cap on the outside of the house or garage somewhere. It would be unusual to have the range exhaust through the roof. In any case, there is usually a damper in the line somewhere, could be at the exhaust fan port on the stove, could be where the pipe cap is, designed to prevent cold air in the winter pushing into the house, and hot air in the summer from pushing into the house. If you lack such a damper, or if your damper is stuck open, or has otherwise failed, you could get hot air working its way into the house. Find the damper, and see if it needs to be replaced.

jpc 07-15-2012 08:47 AM

Hey everyone, thank you for all the input and help, I found the damper stuck in the open position, mine was located directly above the exhaust fan, covered in many years worth of dried up grease, I unbolted the fan and took out the damper, and gave both a thorough degreasing/cleaning and put them back in, and a;fter that the damper opened and closed smoothly with the fan going on and off, Again thanks everybody for the quick help

Windows on Wash 07-15-2012 08:59 AM

Good job!

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