Any unit has to be tight to be effective and avoid problems such as you mentioned. Mine could be tighter with some chaulking and a couple of more screws I suppose but for the present it's good enough as is.

I built a large air intake and pathway (6x6 in inches approx) so at not to restrict air flow through the charcoal. The pathway then narrows to a 1.5x4.5 inch opening where the air enters the blower chamber. The air is then exhausted by the blower through a 2 in. diameter opening out the back of the blower and through an exhaust opening out the box. Also the exhausted air flow is not impeded by ducting that's too narrow. So when the blower is in operation I believe it's not starving for air nor choking when exhausting.

I'm no expert and used guess work when deciding the dimensions for my design so I can't say that the air flow through my filter is perfect and that it doesn't affect CFM input/output but I tried to make allowance for this factor and it appears to do the job I designed it for. Hope this helps you in your design.

idk ill see how it goes when it becomes time

__________________
There is one limit to how much i smoke, which is my amount of weed.
http://www.rollitup.org/grow-journal...-bag-seed.html - my first grow, check it out post your thoughts, any input is appreciated unless your just being a dick

Here's some pics of my filter in action so to speak. I added some 3 inch ducting which is connected to a flange that's mounted on the exhaust end of the filter unit. The filter is located up top in my cabinet where it draws in the hotest air. I ran the ducting down to the floor of the cabinet to exhaust the hot air there so as to heat the grow room in the colder months.

The temps are averaging around 80 degrees fahrenheit because the air is not being exhausted outside the cabinet. There is some exchange with room air as I keep the doors open a bit to help moderate temps which can go above 80 degrees if the doors are shut. I shut the doors during the dark period which causes temps to hover around 72 degrees. Heat is generated using a ceramic reptile lamp which runs 24/7.

Attached Images

	1.jpg (44.9 KB, 8 views)
	2.jpg (44.8 KB, 6 views)
	3.jpg (56.4 KB, 7 views)
	4.jpg (48.6 KB, 10 views)
	5.jpg (41.4 KB, 8 views)
	6.jpg (59.5 KB, 6 views)
	7.jpg (44.4 KB, 7 views)

nice! i have a question(NOOB) can i keep the carban filter inside the grow room or does it have to be outside?

yes, as long as there is room for it in the grow room, and its completely airtight except for the air going into the exhaust fan and the cleaned air coming out of the other side

__________________
There is one limit to how much i smoke, which is my amount of weed.
http://www.rollitup.org/grow-journal...-bag-seed.html - my first grow, check it out post your thoughts, any input is appreciated unless your just being a dick

ok
thanks

Thanks! Troglart's correct. It could be outside too depending on your needs. I configured mine for use inside my grow box to remove plant odor.