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Have a question about exhaust size

phillykid

Member
Hi Guys,

I'm not completely new to this but haven't grown in awhile and looking to use a small closet or build a small cab. Here's the run down:

Lighting
400 watt Solis Tek eballast (dimmable)
super sun 2 hood
250 watt estart hortilux mh for veg, 400 watt super hpd horti for flower

Will start in styrafoam then to 1 gal airpots for veg, once sexed women will go into 2 or 3 gal airpots.

Start about 12 seeds to get around 6 females. Will use a 4X2 flood tray with drain fittings, coco + perlite for media.

For ventilation:
Passive intakes.
Exhaust: Soler and Palau mixed vent fan. Not sure what size to get. For now, I am not going to use CO2 so I will have only 1 exhaust fan which needs to pull through a carbon filter and push through the reflector and out the cab. I will be going with Filter-Fan-Reflector-exhaust. (just heard that this would be better for the longevity of the fan.

How many CFMs will I need? Room would be approximate 3ftX7ft closet with about 8 ft ceiling (I am only using about 1/2 the space).

Would the TD200X be enough? At hi-speed it's rated for 478 CFM. The space is pretty big for the size of the light, but like I said, I'm only using half the space. At 168 cubic feet I should need 504-840 CFM for 3-5 air exchange per minute, but my light is only 400 watts and there is a lot of room for the heat to disapate a bit so I don't know if I could get away with this fan.

Or should I just get a centrifugal fan like an elicent?
 

epicbud

New member
Hi. IMO, it's always best to separate the lights area from the grow, if you can. That way you really don't need to worry about the heat at all, as you're using one fan to cool the lights and a separate one to vent the grow down below.
 

RonSmooth

Member
Veteran
Pull air, dont push it.

Filter > hood > fan > out

Get a fan that fits your filter and hood. If they are 6", get a 6". Dont use reducers if possible. You can always get a speed controller and turn it down. I find that a more powerful fan turned down is quieter than a weaker fan at full power.
 
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