How to calculate extractor and carbon filter sizes in metric

[Invisible Rasta]

hello guys I am stuck with figuring out what kind of filter and extractor i need for my 240x120x200 cm grow tent. I will be putting two 600W HPS lights.
The phat website doesnt have a metric calculator so here first troubles...
i converted the room to foot 7.87402 x 3.93701 x 6.56

so the calculator says i need:

Maximum Scrubbing
375cfm 635m3/hr.

Recommended Single Pass Filtering
200cfm 325m3/hr

not a clue on whats the difference here between scrubbing or single pass.

their website says i would need a 6x16 filter... is that correct?
6x16 (150x400) 20 lbs 9 kilos

so this would be the correct minimum sizes for this kind of tent?

now how do i calculate what extractor i need? do i just put an extractor with 375cfm or 200 cfm or a bigger one?


..going nuts...

 

[jikko77]

volume x number of time you want the air to be changed, at least 70 time per hr
i.e. ambient 2x1mt; height 2mt = 2x1x2 x70 (number of time you want to change the air) = 280m3 so you want something that atleast can change 280m3/h

in your case:
(240x120x200) x70= 403,2 mq3/h

just my

 

[Invisible Rasta]

oh i was about to order a 1000mq filter and 1000mq extractor. i am glad somone gave me the right formula to calculate it... so much mony saved with this

 

[Invisible Rasta]

will a 150mm filter and extractor be good or should i go for a 200mm?