When looking at fans, one thing to keep in mind is that more airflow is better than less - as long as you have the right size filter attached.

I've got a 3'x3' Hydrohut that I use. I had a lot of trouble with heat on the first grow I did in it, so I ended up buying a bigger fan to deal with it. I've currently got a 305cfm Canfan, with the 1900 Canfilter attached. That's almost twice the air movemnet I'm "supposed" to need, and the tent still gets warmer than I'd like.

One other thought, if you don't have one and can afford the cost, invest in a cool tube for your light. It'll make a huge difference. Wish I could afford one lol.
Help_Needed Reviewed by Help_Needed on . Thinking about getting a growtent If I got the The HomeBox - Portable Grow Tent and I currently have a 600 Watt HPS How do I decide how big of a vortex to get? would the 4 inch be good enough? Rating: 5