vent in my kitchen

[smr]

There is a vent with Microwave in my kitchen above the cooking oven. I always turn on the vent whenever I cook sth. But strangly, the vent will blow the wind into the house instead of pushing out. I went to my back of my townhouse, I noticed there is a hole in my vent area. So I guess this vent have a path to push the air out, but why it didn't do that way?

Thanks for your any input.

[LazyPup]

Most of the vented range hoods have a small flapper similar to that in a dryer vent. If that flapper is stuck in the closed position the air will blow out in the house.

[imeduc]

Ah yes but did they put it in. If you check at a store and look at them .They come to vent inside through the filter there. Then like lazypup said there is a flipper.That you can put in it to duct out the back are up into the cabnet above it then out side by duct or pipe. So you have to look around and see what you do have there. Why do I know this. All of them down here vent inside. AND I JUST HAD TO PUT A NEW ON IN MY HOME HERE AND I LEFT IT VENT INSIDE. yes I have vented a lot of range hoods

HAPPY HO HO ED

My mistakes dont define me they inform me.

[smr]

imeduc:

I don't quite understand what you said. how does this flipper look like?

Thanks.

[smr]

The link is a model similar to mine. Could you guys tell me where is the Flipper you mentioned?

http://products.geappliances.com/ProdContent/Dispatcher?REQUEST=ITEMID&itemid=49-40330

[Hube]

Smr; this "flipper" is also commonly called a "Back-draft" damper. It is in a closed position when the fan is off ,thus preventing any air from outside from entering.
When the fan is on, this 'flipper/back-draft' damper opens up and allows the exhausted air to be dumped to the outside.
Some times this flipper/back-draft damper is located just at the end of the fan Housing,(behind the filter) and sometimes only at the vent's exiting point. Some times there is one at each location, and sometimes there are none. And sometimes they do stick and not open up when they are supposed to.
You have to locate yours and MAKE SURE it OPENS UP when the fan is activated.
Good luck, Hube

[Dean]

Even if the flapper is missing the air sould still exit through the duct work when the exhaust fan is "on" unless the duct is not connected or leaking.
A missing damper would just let outside air blow backwards through the system when it is turned off.

Where "in the house" does the air come from?

[LazyPup]

You are correct that if the flapper were missing it would still vent outdoors if a duct is installed, however, if the flapper were coated with cooking grease residue, which is common, and if it is stuck in the closed position, also common, it would obstruct the duct thereby forcing the air to disharge indoors.

If its installed, the flapper is usually at the optional discharge port and there should be a cover over the inside air discharge port.

I have prepared a drawing of the typical air flow pattern in a range hood......

[imeduc]

I went to that PDF SMR and if you look on that one to vent up or out the back you have to change the fans around. No I did not see a flipper frame like has come with mine

ED

My mistakes dont define me they inform me.