Help me find a fan. How much CFM do I need?

[lazy smoker7]

OK my grow area is W 4ft x L 6ft x H7ft .... how much CFM do I need? and when I find the cfm do I buy 2 fans? because I would like to buy a fan off insidesun.com and I nottice they sell fans like ex: inline fan 200 cfm or whatever... so if i needed 200 cfm I would buy 2 200 cfm fans to ventilate my room? Thanks if you could help

lazy smoker7 Reviewed by lazy smoker7 on 05-01-2007. Help me find a fan. How much CFM do I need? OK my grow area is W 4ft x L 6ft x H7ft .... how much CFM do I need? and when I find the cfm do I buy 2 fans? because I would like to buy a fan off insidesun.com and I nottice they sell fans like ex: inline fan 200 cfm or whatever... so if i needed 200 cfm I would buy 2 200 cfm fans to ventilate my room? Thanks if you could help Rating: 5

[lazy smoker7]

oh also theres going to be a 1000w hps light in this room if that should push me to to buy a bigger fan or not... i dunno

[lazy smoker7]

also there is going to be a 1000w hps in this room so I dunno if that would contrube to what size fans i need... i dunno just thought that would help ( lol i didnt nottice I alrdy posted this post right after i just posted it lol.. sorry for the double post)

[r00tdoctor]

My grow area is of a similar size walk in closet, and my 400hps + 150 watt's of cfl's can get it quite warm with out ventalation the hps bulb gets hottt , it will get warm expecially a 1000 watt. You might want to invest in a cooltube. It also depends on the rooms tempature that the the ventalation is intaking the air from.

Here is a simple Exhaust Fan CFM Calculator
Hydroponics Exhaust Fan CFM Calculation for Gardening Indoors by Cheap Hydroponics

Hope this helps but the next project on my agenda for my 400 watt is a cooltube because there hotter then I though they would be lol.

[lazy smoker7]

thanks rootdoctor for the link.... i not going to try to get the cooltube though because I saw a grow log with like a guy growing a plant with 1000w light in a cabinent with out a cool tube and i am intaking air from inside so i dont think the cool tube will be neccasary. anyways thanks again for the link

[lazy smoker7]

hmm says i only need 33.6 ... seems alot less than i expected.. anyways Root since you have a similar size grow area..... what is the cfm you need?

[lazy smoker7]

i just confused because all the fans i see for sale only move like 100+ cfm... so what fan should i get? oh also root doctor if its possible to get me info on your ventilation system of your grow room it will be very apprecaited like what fan you use and the cfm...

[r00tdoctor]

Right now my ventalation is a little ghetto a recirculating fan moving air around in the closet and a household room fan to exhaust air out the closet , soon the ventalation system is going to be updated with a cooltube, and a inline fan.

The fan im getting is gonna be Hi-Tech Garden Supply

Nice and cheap and will do the job,and Ive ordered from them before there quick and stealth.

Its fine to have a fan with higher cfm expessially if you plan on using something like a carbon filter (to minimize smell) thats going to lower the cfm rating. Its always better to have a high cfm rating.

[lazy smoker7]

thanks again man.... good price too compared to all those other fans i see