Bettter to exhaust outside or intake from outside?

[clstgrower]

Using a drier duct whats better for a 3 x 5 room . Using it for intake or exhaust? The duct is high about 4 1/2 feet from ground. putting an intake fan, where would it be better on the ground or in the air?

 

[clstgrower]

I forgot to mention the drier duct blows outside.

 

[Albert Hofmann]

Use it for exhaust...you want exhaust high and intake low as heat rises. If your room isn't sealed and you use a big enough exhaust fan you may not need an intake fan at all...you may have enough passive intake air.

 

[clstgrower]

Use it for exhaust...you want exhaust high and intake low as heat rises. If your room isn't sealed and you use a big enough exhaust fan you may not need an intake fan at all...you may have enough passive intake air.

Alright now how many people let the exhaust go outside. A back draft during the colder days, and when the lights go out it gets cold in there too cold for the plants. I put a heater in there before.

 

[Albert Hofmann]

you need to scrub the air before it goes outside...as for the backdraft, if you are concerned put a flapper to prevent air from comming in...most dryer vents already have them on the outside of the house