Grow Hut

kedeutshenarycoworker

I Have A New Hut That Is 4x8x7 And I Also Have A 600 Watt Hps In There. I Want To Put Two FanS In There, One For THE Light And One For Hut. How Big Should Each One Be. I AM PUMPING AC IN TO HUT. NEED HELP THANKS

DieAbetic

6 inch duct fans. i use this for my grow hut: High Tech Garden Supply

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"Remember, you can never overdose - you can only under-dose. We are just making sure we aren't under-dosing."


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scott06

lot's of caculators on the net to find out how many cfm have pulling...some are for venting for healthy air and some will tell you about heat, here is an example

Free fan calculator. Find the right size exhaust fan for your hobby greenhouse.

my guess would be about 250 to 400 cfm just to keep the air healthy

most people suggest that the air be fully exchanged once every five minutes for optimum plant health...I think that is a tad bit high

kedeutshenarycoworker

Thank You Very Helpful

videoman

kedeutshenarycoworker, there is a math formula to follow.

A 90 CFM with a 600 watt light will raise your temperature above the intake by 21°. The 240 CFM fan will raise it 8°. 90 CFM wouldn’t be enough. It’s not the size of the cabinet that you want to take into consideration; it’s the wattage being used.
(watts = heat)

(600 × 3.2) ÷ 90 = 21.33
(600 × 3.2) ÷ 240 = 8

To find how much the light will warm the room with a different size fan you can just use the formula. Just take the wattage of the light and multiply by 3.2. Then divide the CFM of the fan to find how much the room will warm in Fahrenheit degrees.

For instance:
If the temperature of the intake air is 75° and you’re using a 600 watt light, the temperature would go up 5° if you used a 384 CFM fan. So, the temperature would end up 80°.
(600 × 3.2) ÷ 384 = 5
5° + 75° = 80°

One more thing to consider is the QUALITY of the fan being used. Those cheap inline fans like the one being used by DieAbetic are just okay at best.

They are not designed to do the job by themselves, they are designed to "assist" in pulling air thru duckwork, when a room is too far away.

You ultimately want a canfan, something like this.
Peace

kedeutshenarycoworker

Hey Video Man Thank You For The Math Very Useful.
I Want To Go With Canfan 400 Cfm For The Light And Do You Thing I Sould Do The Same One For The Hut? Two Total.

videoman

The air intake can be as simple as some holes at the botton of the tent, as air is pushed out, i will pull new air in.

The rule of thumb for intakes is they should be 1.5 times the size of the exhaust, as yo dont want to strain the fan.
Peace

kedeutshenarycoworker