Hi

This is my first grow, i am using a 600w HPS light in a wardrobe and not entirely shure what ventilation i should be using. Would a ordinary 4" or 6" extractor fan be sufficiant

Any help will be greatly appreciated

Cheers

Use two fans. One down low, pointed inward. One up high, pointed outward. See how this works at venting and exhausting. Remember, if the inside temperature reaches 95 deg f for very long, your plants will die.

You need to air cool that light separete from the rest of you ventilation. Go read a few journals. You will find everyone that can't leave the closet door open has discovered this and had to add it. Who the heck was it posted an excellent example of how to accomplish this. This is the one of the reasons I recommend the T-5's for closet grows. Don't produce the heat you don't have to deal with it. Gives you about 2 more feet of usable height for growing and will perform as well as a 600watt hid. Rollitup posted setups showing ventilation.
Assuming you insist on an hid, no a 4" or 6" extractor fan will not do it by itself. Between 2 and four will plus an oscillating fan. VV

ehat size fans would be the best to use that are not expensive as i am on a bit of a budget

get a squirrel cage or inline fan. calculate the cubic feet of your box. you will want a fan that will change that amount in less than a minute with a 600 in there. C.F.=C.F.M. so u can change the air every minute. u will want alot of good ventilation in that box. if not your going to run into more problems than ya got now.

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venting the light separately from the room will make your plant's life much happier.
I agree with billybob88 but would recommend your fan can change the air 3 times a minute (3x3x6=48 cubic feet so a 150 CFM fan would be ideal for that size room).

Get a vented reflector with glass for your light and vent that with a smaller fan and you shouldn't have a heat or burnt leaf problem.

what does cfm mean

cubic feet per minute. Good advice email, venting your lights makes your life so much easier. i can touch the glass right beneath the bulb and not burn my hand with my vented lights

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thank you man

oh fo sho!

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