ventalation question.

if i have a 15 by 12 by 8 foot room that =1440 cubic feet.

do i need to have a 1440 cfm exhaust fan or a 4320 cfm exhaust fan?

if so how do people ventilate entire houses/buildings?

is there a store that i have never seen that sells 12000 cfm inlines and carbon filters or do people buy 3x 4000 cfm inlines?

if i had two spare bed rooms and wanted to make one my veg and one my flower room what size fan would i need be 15 by 12 by 8?

You want to be able to vent room within 5 minutes or so.
Divide your number by 5 and buy the next larger size. Don't forget ducting will need to be figured in.

Your number is 288 so a 440 should be plenty for a single room of the size you stated.
Cubic feet divided by 5 minutes plus the drag created by ducting etc.

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You would need a 6 inch exhaust fan usually they are 440 cfm or more. I use the 6 inch just fine and it vents my 12x 10x 8 room just perfectly

These estimates don't account for cooling temperature differentials.

Hotter intake temps require faster turnover rate.

Not to over complicate the subject but you want to know how many lights
You plan to be using as more lights means more heat. Will you be venting via air from the grow room or pulling it
From another room through the hoods.

Will you be using co2.
Will you be running a dehumidifier/air conditioner.

SnapsProvolone said:

These estimates don't account for cooling temperature differentials.

Click to expand...

SnapsProvolone said:

Hotter intake temps require faster turnover rate.

Click to expand...

Thats why if 1000 watters are involved I always recommend at a minimum running 8 inch fans, if not 10 inch fans and speed controlling from there.

a 6 inch fan running balls out is WAY louder than a 10'' slowed down moving the same cfm, and cost differnce is nominal between the two sizes of fans and duct work.

i get what you guys are putting down. every forum / book i read says different. some say i need to exchange air 3 to 5 times a min and i would need the biggest fan for that.

how do you figure in ducting?

my first grow was in a 10 by 12 by 7 i think and it was a tent i made out of studs and plastic. i bought a 720 inline with a 300cfm scrubber. then after that i always had a micro grow and used the same fan with with a speed control on low. had it hooked up to two 3 by 2 by 3 cabinets and that baby pulled! haha

now that i have plenty of space i want the option to be able to use all of it without any ventilation / heat problems or having to buy more fans/filters. the space is 3 rooms and the first room has a loft above it. the loft will just be a work space, no growing because it gets a little warm up there. over all i want the option to scrub the air out of 8000cf from 3 large rooms. 2000watts to a possible 6000watts in hids over time. i want to use a ebb and flow or nft system.

i have a 8in 720 hydrofarm inline that i will use to cool bulbs. i dont have central air but plan on buying 1 or 2 portable air conditioners as needed.

how would you exhaust a space that big? do i a get few fans or just one big one? i want to be as efficient as possible but dont want to smell my grow downstairs or definitely outside.

the air that cools the lights will be from out side. cold as shit in the winter and 90s in the summer. wasnt planning on running co2 but would it be more efficient with running ac units and venting outside or is the price of co2 via natural gas in a air tight environment.

also iv never seen in person or used co2. is it really worth the investment? i hear they tolerate temps high temps, 25% faster, and 15% to 35% bigger yields. is that really true? do you not run co2 when your in the room or how does that work?