www.weedguru.com

Besides the size what the difference between the two?

Got pics?

Havent got the 100mm one yet just ordered it today.

100mm
http://cgi.ebay.co.uk/HYDROPONICS-IN-LI ... 1694184596

This is the 150mm 1 but in black
http://cgi.ebay.co.uk/150mm-6-AIRTEQ-AV ... 1e5fae7abb

which one should i use for exhaust

& here`s some freshly taken new photies of my babies at 23 Days









They beginnin to look pretty

Begining to look gorgeous more like.

They gettin very smelly now im havin to draft in the air fresheners lol

You know, fan size depends on a few factors like how much ducting you are gonna be using and how many curves and turns there are in the ducting amongst other things. There's a mathmatical formula to calculate fan size

Have a look at this guide

http://www.weedguru.com/forum/viewtopic ... 88&t=26677

Those fans you showed me are not in CFM but in m3/hr...1 m3/h = 0.5885745 CFM

http://joshmadison.com/software/convert-for-windows/

The babies look great btw

Shit thats complicated i just wanted to know if i should use the more powerful of the 2 for extraction lol

Lmao I cnt give advice on what higher saying about the fans cuz in to loaded n don't understand that stuff but other than that,those bbies are fkn beautiful

I'm to loaded*

lol think i`l just go with the gut & use the powerful one to extract.
i could stare at them for ages their near enough beginnin to put out a new set of leaves every day ive decided im gona give them till they preflower of their own accord i dont want to force them into flowering "from what ive read it can stress them"

Well if you give me your growbox dimensions I could try and figure out the proper formula for ya. I managed to do it for myself once so...

4ft x 4ft x 6.5ft if i did a bit of DIY work i could get about 8ft in height instead of 6.5ft

Room volume

4x4x8 = 128 cubic feet

CFM required (absolute minimum cfm for exchanging the air in a grow room.)

128 divided by 3 = 43 cfm

Additional Factors

For non aircooled HPS light add 10-15%. Assuming you have a small HPS light we'll add 10%

So 43 cfm x 10% = 47.3 cfm

Assuming you are in a warm climate, we can add 20% minimum on for that

47.3 X 20% = 56.76 (57 cfm)

So you need a fan capable of pushing atleast 57 cfm..lets say 60 to make things easier

60 cfm = 102 cubic_meters_per_hour m3/hr

So you need a fan that pushes a minimum of 102 m3/hr

You will need more than that if you have a carbon filter or long ducting between the box and fan

I hope thats right lol

thanks higher my new one pushes 110cfm, the variable jet engine fan pushes 353cfm at full power give or take lol,

Cool, that'll be perfect then!

Jet engine.....lol