magicaljerry

My growspace is a

6 feet wide
2 feet deep
8 feet high

closet.

I have in mind a 210 CFM inline duct fan, but I am not exactly sure what I'm going to do with it after I buy it.. :-P

Suggestions? Help? :-)

seven

Hi magicaljerry, welcome to hc.com
If you need to create negitive pressure you must use the exhaust fan to vent the room, by doing this you now need an intake... a passive one is fine[ meaning you don't need an electrical fan for intake]. the intake will of course draw air in through the air inlet, so there is no way any air can escape out through unseen cracks and things.does this make sense? If you had positive pressurization then air would force itself out through any cracks that you might have instead of going out through the exhaust vent. I hope this helps you a bit.
Also you will want to draw the air from the top of the grow room as this is where the heat will collect. then there is the way where you use the exhaust air to cool your lights but this is something all together different.,

magicaljerry

Will I need an electrician to install this fan?

magicaljerry

The magicman has no experience whatsoever with installing electric appliances :-/

I really want to achieve this for odor control..

edit: check homedepot.com for the 8inch in-line duct fan

That is the fan I will be purchasing..

unregistered190

CFM thread.......

hope that helps - 190

PaoniaPurple

That fan is fairly easy to wire. A couple (actually three) of wire nuts, and an extension cord. Cut off the 'female' end of the cord (with it unplugged, of course), strip about 3 inches of the outer insulation. Strip about 1/2 inch of the inner insulation on the three conductors inside the cord. One will be black, one white and one green. Wire these with wire nuts to the same colored leads on the fan. Plug it in (preferably to a power strip with a circuit breaker), and you'll have air. If you want to actually measure the negative pressure, that's simple, too. Take a length of clear vinyl tubing-aka aquarium air tubing. Poke a hole in your grow closet and run one end of the tube in there, sealing the hole as best as you can. On the outside, make a "U" of tubing, maybe by taping the plastic to a peice of cardboard or something. A useful size of 'U' is about six inches high. Fill the bottom of the "U" with water. Notice that the water level on both sides of the U is the same. Turn on the fan, and the water will rise a little on the low pressure side-the side going into the grow room. Measure the difference in height of the water on opposite sides of the 'U', and you have the vacuum in 'inches of water', a common term for small vacuum differentials. If your negative pressure is great enough, the water will suck all the way through. Two to three inches of vacuum is plenty to assure that odors will remain in the box and the exhaust stream. For the geekier reader, this device is called a differential manometer. Now you know.

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You can lead a horticulture, but you can't make her think... Dorothy Parker

seven

I think I like your way better too S2,
and if you don't have a cigar or say don't smoke then you could always use a doobie to test with...lol. But I bet it's safe to say that if you check out your exhaust and you feel air coming out then you probably have negitive pressure

PaoniaPurple

So sue me for excessive geekiness. Anyhow, that's how the info freaks do it... As a Buddhist buddie said, "negative pressure is an illusion, think about the sound of one hand almost clapping..." Oh, well.

__________________
You can lead a horticulture, but you can't make her think... Dorothy Parker

naturall_mystic

Magical Jerry, I would say you definitly need an electrician to wire that fan. As long as he is there have him wire you an outlet for you lighting. Be Safe.

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