can filter not working? plus, temps still too high!

i'm growing in a 8x10 room and got a fan and filter today. i'm venting the air coming through the can filter out the ceiling, into my attic.

two problems: one, it still smells. two, it's still hot!!

it's a 6" centrifugal fan atop a can 33 can filter. the fan is rated at 435 cfm, and the filter is rated at 200 cfm for exhaust.

what is the deal?? what am i doing wrong?

i can tell that the fan is pulling a lot of air out--the door wants to suck back when you try to close it on your way out.

is it an issue of bad fan/filter pairing? an air intake problem?

more like you need a passive air exchange into your grow room
or a way to push that amount of air into your room.

what kind of light? any possibility of shutting down the heat vent to your room? do you have a backdraft preventer on the end of the exhaust? is there a vent to the outside inyour attic? are there alot of bends in your ductwork and is it insulated? sorry for askin so many questions theres just a range of possibilitys.

that and i think the 200cfm rating on the filter means that is works best at a flow rate of 200cfm with your 435 cfm fan how quickly the air passes through effect how well your filter scrubs the odor from the air. the longer the it takes the more odor will be removed. the next question is how much does the filter restrict the cfm ?

svchop889 said:

that and i think the 200cfm rating on the filter means that is works best at a flow rate of 200cfm with your 435 cfm fan how quickly the air passes through effect how well your filter scrubs the odor from the air. the longer the it takes the more odor will be removed. the next question is how much does the filter restrict the cfm ?

Click to expand...

unless i am mistaken you have a little 13 inch can filter??
on an 8 by 10 room?
i can only assume you have more then a few plants.
the Can 33 is a worthless pos. not really even sure why they make them.

it will never work for that size room.
i have one of those and it is worthless. trust me.
you need to invest in a bigger filter.
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if your filter is rated at 200 cfm and your pulling at 400 you are overtaxing the filter. couple that with the hi temps and you are not gonna get it to work. filters don't do well if they are too hot. also if the humidity is high they dont work well either.

one more thing you said you have a 6 inch fan?
likely the reason your room is overheating is due to the can filter restricting the exit air. you should set up a passive intake at least 6 inches what you want in any room is Negative pressure inside the room the air pressure should always be lower inside to prevent smells.

ORGONISM99: "what kind of light? any possibility of shutting down the heat vent to your room? do you have a backdraft preventer on the end of the exhaust? is there a vent to the outside inyour attic? are there alot of bends in your ductwork and is it insulated? sorry for askin so many questions theres just a range of possibilitys."

I have two lights: a 400w MH and a 1000w HPS. I closed the heating vent off last night and that seemed to help a bit--it was responsible for a two degree temp jump I saw once I turned the heat on last night. I don't have a backdraft preventer--what's that? I have some idea, but what is the point of it and how important is it? There are vents in the attic that run outside. I was just advised to run ducting all the way from the inside of my room through the attic and attatch to one of these vents. Any opinions on this? There aren't very many bends in my ducting at all and it is very short.

"that and i think the 200cfm rating on the filter means that is works best at a flow rate of 200cfm with your 435 cfm fan how quickly the air passes through effect how well your filter scrubs the odor from the air. the longer the it takes the more odor will be removed. the next question is how much does the filter restrict the cfm ?"

hm...ok so if that is the flow at which the filter is supposed to work best, is there a way to get my fan to drop down to that level? would a speed regulator do that? how can i find out how much the filter restricts the cfm? i guess it is a bit of a catch-22? my fan is too big for the filter so the filter doesn't work, but i may need a bigger fan to move the amount of air i need to if i'm running it through a filter?

unless i am mistaken you have a little 13 inch can filter??
on an 8 by 10 room?
i can only assume you have more then a few plants.
the Can 33 is a worthless pos. not really even sure why they make them.

it will never work for that size room.
i have one of those and it is worthless. trust me.
you need to invest in a bigger filter.

I think the filter size is ok for the room size--it is the size a few people at different grow stores recommended to me. for the size.



OK so I think I should vent the 1000w hood at least. Question is, how can I do this? Should I run ducting from it to a t-joint in the ducting coming from the filter and can fan? would the pressure from that fan be enough to also sort of passively suck the air from the hood? Or should I vent it some other way?

Thank you guys so much you're helping me a lot.

I know nobody is probably reading this anymore, but just in case, here is an update:

The fan I had was much too powerful for the filter I have. So I got a different, less powerful fan and set it on top of the filter and it totally works now. Dumb mistake. Thanks to svchop for straightening that out for me.

So that fan/filter setup sits high in the room and is not connected to any ducting or anything.

So I vented the 1000w hood and have the big fan pulling air through it, pushing it up into my attic. It was such a relief to get this all set up and working.

It's been working great for a few weeks now, and I'm three weeks in to flowering!