what size fan should i use. 150A or 150L. there is quite a difference in package prices? cheers guys

would 420m an hour be enough after losing power through the filter? or would i need the L version

i think the growroom tools tell you how much ventilation you need for the room dimensions you input and that includes ducting and a c.filter.
i think the rvk 100 a1 thingy comes to nearly double the size of my growroom so im guessing that will be more than enough for what i need it for.
-fuzzpot

I have the homebox xl 1.2x1.2x2 using both L1 for outtake and A1 for intake, I use a fan controller for both. Come summer time the fans will be on full power, hope this helps.