What size extractor fan 90x90x160 tent

**digidy** · 18-07-12, 07:15 AM

What size extracted should I run in my ds90 tent my mate has lent me his 4" but no carbon filter so I need to buy one but don't want to buy a 4" if I need a bigger fan running a 600w hps

**Axeman** · 18-07-12, 10:33 AM

In my humble experience i can only tell you what i've encountered, am running a DR100 grow tent, 400W MH/HPS light with a 4" fan sucking through a carbon filter in my tent, and i have problems with high temps i have a 5"intake fan sucking in air from open window. Its only really a problem when its summer though, so it must just be on the limit of what a 4" extraction fan is capable of when i upgrade to a 600W light i will be upgrading to a larger sized extraction fan to deal with hotter bulb and any hot future summers. Hope it helps you buddy. Am sure someone will be along far more knowledgeable than me :-) toke on

**Anonymiss** · 18-07-12, 12:35 PM

Although a 600 Watt HPS will be OK in that space, it's right at the top end of the illuminance scale and the benefits over a 400 Watt lamp may be minimal (law of diminishing returns, and all that).

400 Watts might be a better move, and may give very nearly as good a yield for 50% less power usage and heat production.

**digidy** · 18-07-12, 01:50 PM

Got an adjustable ballast so could always run it at a lower wattage

**psychocannanaut** · 18-07-12, 01:57 PM

i run a 250 in a 60x60x160
with a 5" extraction and 4" intake
so you'd want atleast a 5" extraction mate

**The Lost Soul** · 18-07-12, 06:32 PM

Buy a digital dimmable 400w ballast and you'll have a lot more control of your temps, also, a fan speed controller helps a shit load when growing in a tent.
Cheers

**digidy** · 18-07-12, 07:05 PM

Whats a decent make ballast guessing 600w is a no no in my tent

**Double Zero** · 18-07-12, 07:37 PM

Lumatek do a good dimmable, about a ton for a 400 from some stores

**The Lost Soul** · 18-07-12, 07:51 PM

Lumatek Digital Dimmable Ballast with 4 settings - 440w super lumen - 400w - 275w super lumen - 250w, and it takes MH and HPS - £109.95 - bargain!!

**Boycie** · 18-07-12, 07:56 PM

Originally Posted by The Lost Soul

Lumatek Digital Dimmable Ballast with 4 settings - 440w super lumen - 400w - 275w super lumen - 250w, and it takes MH and HPS - £109.95 - bargain!!

Can you find me a 1000w same brand under 190? high 5 either way soull man

**The Lost Soul** · 18-07-12, 07:59 PM

Give me 5mins Boycieeeee matey.

**The Lost Soul** · 18-07-12, 08:02 PM

Can't find the same brand but found a 600w - 4 settings - Digilight - £124.95
Exact same spec as the Lumatek. 2 year guarantee.
I'll keep lookin mate.

**The Lost Soul** · 18-07-12, 08:06 PM

Just found a Lumatek 600w Digital Dimmable Ballast for £120. £127.50 including delivery.
Cant put up the link, pm me and ill tell you where to get it.
Cheers

**digidy** · 18-07-12, 08:48 PM

my mates lent me his lumatek 600w its only got 2 settings its the old one and 4" intake and 4" exhaust fans. set them running now to see what temps i get about 18" under light with the light off think im gonna have to go with a 400w light think its going to be too hot

**digidy** · 18-07-12, 09:12 PM

ok with light off but way too hot with light on so going for a 400w do i go cooltube or normal exhaust weith 5 or 6" fan

**frost313** · 21-07-12, 11:31 PM

5" exhaust ruck with a dr120 should be alright shouldnt it? with a parabolic 600w hps?

**digidy** · 22-07-12, 12:47 PM

iv ordered a 6" rvk a1 for mine and a 400w hps with adjustable ballast frowm 250-400w just to be on the safe side just waiting for them to come also mines in the loft so its already warm up there. il let you know my temps next week its 24.9c in there at min with 2 small flouresent bulbs with a fan blowing no inlet or exhaust fans running