Reccomended CFM for 400w hps cooltube

[Rooster]

Hey guys

 

Was looking at bunnings the other day, and the have these bathroom fans that are centrifugal and claim to move 200m3/hour out of a 4 inch duct-hole.

looks similar to that http://www.universalfans.com.au/univ_images/exh_03_ceiling/pop_ups/Exhaust_body.gif

 

Want to run this just as a cooltube exhaust, with the total length being no more than 2m at the absolute maximum. Im choosing this cause its cheap, easy to install, VERY QUIET and readily available.

 

Any thoughts?

[Gazza2001au]

how much are they? what "seems" quiet in shops tends to be very loud in your grow room keep that in mind when shopping for a fan

Reccomended CFM for 400w hps cooltube, fan reccomendations

i move around 220 cubic meters per hour thru mine with a 400w HPS it does the job well

[Rooster]

around the $50-$60 mark. Its a 250mm version. I think ill grab one tomorrow and install it. Ill wack a cooltube on it and we will see what we get.

[calaman]

a 250mm fan says that itll pull that much thru a 4' hole? I was at bunnings the other day looking at the exhaust fans and couldnt find any flow rates on em. I spoke to the help and decided to keep my 40W boxfan on its side up there. I wish i could approximate what sort of flow it moves though.

What diameter are cooltubes usually?

[shirty]

what "seems" quiet in shops tends to be very loud in your grow room keep that in mind when shopping for a fan

 

 

 

yep , Gazz is on the pulse there.. "quiet " when theres ambient sound ahoy is one thing , ... but when its 4am , & the crooks are prowling etc , "quiet" takes on a whole nuther definition..

 

& I personally dont trust any figures given by ROC manus regarding lpm / cfm /db etc etc..

 

.. lets face it,, they jus making sum crud that they copied from US or European designers , for a cheaper cost/resale etc

 

.. & yeh , Im guilty .. I buy em too .. but buyer beware

 

Rooster , I frequent Bunnings weekly ( its 250m from my house ).. but I aint seen that fan as yet .. looks neat enuff

 

good luck wif it all , I can only suggest the obvious which is to contact the manu direct for details

 

 

p.s. $60 bucks for a decent fan is nothing ,,, a good Westaflex is around $200 .. so look hard at that option !

Edited May 31, 2009 by shirty

[smokinjoe]

If you have a look on ebay you can get an inline allvent fan for less than $100, I've had an allvent of the same design as pictured, running continuously for more than 5 years. An inline job would be more practical for a cool tube I'd think. Edited May 31, 2009 by smokinjoe

[calaman]

I frequent Bunnings weekly ( its 250m from my house )

Fuck Shirty I envy you! As my 11 y.o would say - Bunnings is da bomb!