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1kW, 3'x3', what fan?
- Thread starter gorilla99
- Start date
qupee
Member
1kw in 3x3 is a little much, yeah, 600w would be plenty.
The amount of air you need to move to keep that cool may cause problems with transpiration.
I wouldn't use 2 filters. That's a lot of extra expense for no real benefit, you're also going to have a hell of time fitting a hood, 2 filters, a T, and duct inside 3x3, yikes.
I would get a 8" x 24" Phresh filter and any standard 8" centrifugal duct fan along with a speed controller as you'll probably be able to turn it down a bit. Depending on what order you connect filter, hood, and fan you'll of course need a 6" to 8" converter in there. Since the air is blowing out the window the order should probably be filter -> fan -> hood -> window (arrows point in direction of air flow).
It's going to be a tight fit though, if it was just 600w I'd say like the 6" x 16" phresh and a 6" centrifugal. Hell, probably cheaper to get a switchable ballast that can run his 1kw bulb at 600w and then get the smaller ventilation equipment. It'll certainly work better, and I really don't see you getting much more yield from the bigger light with that constrained space.
The amount of air you need to move to keep that cool may cause problems with transpiration.
I wouldn't use 2 filters. That's a lot of extra expense for no real benefit, you're also going to have a hell of time fitting a hood, 2 filters, a T, and duct inside 3x3, yikes.
I would get a 8" x 24" Phresh filter and any standard 8" centrifugal duct fan along with a speed controller as you'll probably be able to turn it down a bit. Depending on what order you connect filter, hood, and fan you'll of course need a 6" to 8" converter in there. Since the air is blowing out the window the order should probably be filter -> fan -> hood -> window (arrows point in direction of air flow).
It's going to be a tight fit though, if it was just 600w I'd say like the 6" x 16" phresh and a 6" centrifugal. Hell, probably cheaper to get a switchable ballast that can run his 1kw bulb at 600w and then get the smaller ventilation equipment. It'll certainly work better, and I really don't see you getting much more yield from the bigger light with that constrained space.
I would strongly recommend exhausting through the attic,or another room.If you absolutely must exhaust out a window be sure to build a window exhaust box as seen in this link
http://www.youtube.com/watch?v=tELqDZ6f1rI
Also be sure to use insulated ducting (to cut down on noise from the air wooshing around in the ducting),and use a duct muffler to attach the ducting to the exhaust flange on the window exhaust box to cut down/eliminate the noise of air being exhausted out the window.
http://www.youtube.com/watch?v=tELqDZ6f1rI
Also be sure to use insulated ducting (to cut down on noise from the air wooshing around in the ducting),and use a duct muffler to attach the ducting to the exhaust flange on the window exhaust box to cut down/eliminate the noise of air being exhausted out the window.
3.75x3.75- 4x4 floor space for a 1000W HPS setup. Ventilation 101: https://www.icmag.com/ic/showthread.php?t=112862
Yeah, i know, but the dude already has 1kW digital gavita light and a super sun 2 hood.
That's a goood light, and expensive as shit!
I've read that tread already, but I don't know how to count the pressure/resistance the ducking will put on the fan, that's why I'm trying to find someone who has had a similar setup and could share some advise...
8" valuline fan worked for me in the past. Your friend might need a speed controler too.
As others have said,1kw per 3x3 is overkill by about 400 watts.
In a 3x3 400w HPS bare minimum 600w HPS preffered and maximum.
Since you already have the light,maybe just buy a 4x4 tent.The only way I see you getting away with that much light in a 3x3 is by going vertical with 2x 400w HPS or 2x 600w HPS,an assload of exhaust (6" prefferably an 8" inline centrifugal or bigger exhaust fan,and good starting ambient temps.
I run a 400w HPS vertical bare bulb in a 3x3 tent and use a 4" 170cfm inline centrifugal for exhaust/air exchange.A 170cfm exhaust fan will keep a grow in a 3x3 tent about 10°F above ambient temperature (ambient temperature = temperature of the room that the grow tent sits in and pulls intake air from).So if you have ambient temp of 68°F and want the temps in the tent to be no higher than 10°F above ambient while using a 1000w HPS you'll want a minimum of 400cfm but prefferably more like a 747cfm or greater inline centrifugal exhaust fan....if you have to you can always slow the fan down with a speed controller.I say look into a Can Fan MaxFan 8" as a bare minimum.But it's all dependant on what starting ambient temps will be and how much higher you want the temps in the grow tent to be over ambient temp compatability of fan & carbon filter (try to match a fan to a filter that will move the amount of air needed to keep the grow cool.
Also,try to stay away from any 90° bends in your ducting as they will cause a bigger drop in static pressure making your fan less efficient,try to do straight runs with as little amount of bends possible.If you must use bends try to keep them @ 45° or less for more airflow efficiency.
In a 3x3 400w HPS bare minimum 600w HPS preffered and maximum.
Since you already have the light,maybe just buy a 4x4 tent.The only way I see you getting away with that much light in a 3x3 is by going vertical with 2x 400w HPS or 2x 600w HPS,an assload of exhaust (6" prefferably an 8" inline centrifugal or bigger exhaust fan,and good starting ambient temps.
I run a 400w HPS vertical bare bulb in a 3x3 tent and use a 4" 170cfm inline centrifugal for exhaust/air exchange.A 170cfm exhaust fan will keep a grow in a 3x3 tent about 10°F above ambient temperature (ambient temperature = temperature of the room that the grow tent sits in and pulls intake air from).So if you have ambient temp of 68°F and want the temps in the tent to be no higher than 10°F above ambient while using a 1000w HPS you'll want a minimum of 400cfm but prefferably more like a 747cfm or greater inline centrifugal exhaust fan....if you have to you can always slow the fan down with a speed controller.I say look into a Can Fan MaxFan 8" as a bare minimum.But it's all dependant on what starting ambient temps will be and how much higher you want the temps in the grow tent to be over ambient temp compatability of fan & carbon filter (try to match a fan to a filter that will move the amount of air needed to keep the grow cool.
Also,try to stay away from any 90° bends in your ducting as they will cause a bigger drop in static pressure making your fan less efficient,try to do straight runs with as little amount of bends possible.If you must use bends try to keep them @ 45° or less for more airflow efficiency.
Unless stealth is mandatory, you can have the fans outside of the tent, and just have the filter/hood inside. Or even push the air through the filter and have all fans/filters on the outside of the tent.
Not a standard practice by any means but.... if you put a pre-filter before the fan that's blowing into the filter (sucking air from tent) then its no different (in terms of air cleaning) than sucking it through the filter in the tent.
Not a standard practice by any means but.... if you put a pre-filter before the fan that's blowing into the filter (sucking air from tent) then its no different (in terms of air cleaning) than sucking it through the filter in the tent.
