Mandala Kalichakra Grow 1st Timer

[Weedguru Higher]

Besides the size what the difference between the two?

Got pics?

[SativaMonkey]

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

[SativaMonkey]

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









They beginnin to look pretty

[flagg]

Begining to look gorgeous more like.

[SativaMonkey]

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

[Weedguru Higher]

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

[SativaMonkey]

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

[SykonoT]

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

[SykonoT]

I'm to loaded*

[SativaMonkey]

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"

[Weedguru Higher]

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...

[SativaMonkey]

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

[Weedguru Higher]

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

[SativaMonkey]

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

[Weedguru Higher]

Cool, that'll be perfect then!

Jet engine.....lol