Is it ok to just have fresh air intake and no exhuast???(rep+)

tilemaster said:

it would still create an ongoing draft coming from the intake straw so to speak. Not nearly as strong as a draft when the bud room door is closed and the exhaust is running. if you have ur carbon scrubbber hooked to the cieling mounting inline exhausting on a thermostat or timer, ive noticed from down time you can catch smell . so i run mine 24/7, to make sure the air is being scrubbed. Thats obviously a problem with co2 users. also passive intake thats direct to the outside air can be problematic in the winter time if your in a cold environment. if your sucking frezzing cold air youll sweat all over the place in the room from condensation. That should be duly noted in the same regard as venting to a attic in a cold winter area. Dont do it!! Run a line thru the ridge, unless you have plenty of gable venting!. So back to passive intake, i draw cooler air from another source, my crawl space under the home. Its different for every grow site, but passive air is so key. you dont ever need to blow intake with a fan. i started this common mistake by thinking venting my lights was exhausting the room. wrong. exhausting lamps is exhausting just that. stilll got to exhaust the room. better the room then the light itself if your hoods not a ventable make. hope this all makes sense. Hit me up if u gotz ne questions i can answer.

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seasmoke said:

tilemaster is dead on with that. Thats the philopshisy(sp) I follow. And to answer your ? about c02 ppm vs the outside and it being FULL of c02? Outside has an endless supply of co2, as long as its being supplied, it doesn't matter how much there isnin an injch. If you have dead air, then it needs to be suppied, and enough to "feed' the plants. Outside air has eveything your plants need, including co2 in abundance.....a carbon filter on a exhaust vent will take care of smell if done right.

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tilemaster said:

my crawlspace is a concrete footer with pony walls i guess. the ground is exposed. should be plastic sheeting or tarp down there, and there is spiders. i bomb the crawl space every spring. um...well i have basement type windows in the foundation, so theres natural air exchange down there. as i passivly draw from that space wut ever air i take out of the area is replenished with outside air. if ur crawlspace doesnt have ''fresh'' air dont use it. every room is different but the passsive intake idea, with a active exhaust should be used in almost, most circumstances. A 6'' inline fan and carbon scrubber is controlling my 400sq foot 8 lamps bud room. temps may soar a lil during on time, but with the scrubber always running, intake cools the room to 60 with lights off and gives a nice purp to most strains. . .

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