How big of fan for Air cooled hood???

ok I have a 600 watt aircooled reflector, I want to seal my room for CO2, so i need to cool the light as much as possable. I have 2 cheap 6" inline fans (160cfm) and it is not enough, But I also have a Old furnace fan/squirrel cage fan that draws 3.5 amps 110 volts and moves LOTS of air. I had it hooked up to my Light and it worked GREAT. but Is it TOO big??? I want to conserve power, because it is my Medicine i am trying to grow on a fixed income,

should i try to find a 2 amp fan? I have a window A/C in case it gets to warm in there, but I want it to run as little as possable.


my hood has 6" intake/exhast but i am thinking running 8" duct with a 6" adapter for the hood.


I live in michigan, summers are in the 90's in the day time. 60-70 night time.


I am going to run my lights at night time

I will give you my scenario because I have never worked with 600W. Anyways I run two 1000W HPS in a sealed room with co2 and I'm using a 8'' 675 CFM Max fan to pull air from another room and exhaust the hot air into the attic one 675 CFM seems to be cooling my two 1000W'ers just fine. For a 6'' air cooled hood you might be able to get by with a 400 CFM fan to cool those bad boys.. I would say anything over 400 you are set to go and you will be able to keep your hand directly under the glass without burning your hand.

The problem i have heard with CO2 is extracting heat from a sealed room. If you dont exhaust hot air and exchange it for cool air, you just end up blowing hot air around no matter how many fans you use. But if you extract it, you also extract the CO2 defeating the purpose. Maybe there is a way to water cooling it? Works well enough for a CPU so maybe it would work for a light. Or use an inline light and pull air through it without touching the CO2 filled room.

Green Troll said:

The problem i have heard with CO2 is extracting heat from a sealed room. If you dont exhaust hot air and exchange it for cool air, you just end up blowing hot air around no matter how many fans you use. But if you extract it, you also extract the CO2 defeating the purpose. Maybe there is a way to water cooling it? Works well enough for a CPU so maybe it would work for a light. Or use an inline light and pull air through it without touching the CO2 filled room.

Click to expand...

Now a' days a properly sealed room should have a AC. You dont really need to exhaust the air in your grow room these days anymore because the AC brings in fresh air and your beautiful plants produce fresh air too carbon scrubber on the floor 24/7 scrubs stale air left in the room. Just look up CEA ( Controlled Environment Agriculture) CO2 is only used during lights on anyways.

BeaverHuntr said:

Now a' days a properly sealed room should have a AC. You dont really need to exhaust the air in your grow room these days anymore because the AC brings in fresh air and your beautiful plants produce fresh air too carbon scrubber on the floor 24/7 scrubs stale air left in the room. Just look up CEA ( Controlled Environment Agriculture) CO2 is only used during lights on anyways.

Click to expand...

Ahhhh fair enough =) Sounds like an expensive set up though. Is CO2 really that effective?

Green Troll said:

Ahhhh fair enough =) Sounds like an expensive set up though. Is CO2 really that effective?

Click to expand...

I live in AZ and converted my spare bedroom into a indoor garden, all the houses in AZ come with central AC so thats where I saved money or else I would have had to buy a mini split AC.. Is Co2 really that effective? I dont notice any explosive growth or faster finishing times but I do notice my buds have a lot more frost on them then when I run with out co2. Also I only use co2 during the flower phase. Plus being in AZ and the with the hot weather ( I'm in Phoenix, AZ its 106 today ) I can run my sealed room with the central AC on 75 and keep my garden room 75-80 degrees. I'm a hobby grower just so happens I love to smoke and grow cannabis so throughout my grows over the years I'm always adding stuff to my garden or trying/buying new gear. Its definitely bennifical especially if your garden stays in the 80-86 degrees range thats basically why co2 was introduced. Old school growers were trying to figure out a way to combatt high temps in the grow room, they then found out you can grow with co2 with temps to the low 90's.