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Foothills Filter w/ 240cfm fan Exhaust???

S

switch-one

Member
Hello Everyone,

I almost got my room up and read to go. I recently installed my Foothills carbon filter with a 240cfm fan built in. My closet is: 4ftLx2.3ftWx6.9ftH. I have a 400watt HPS light installed with a horizontal reflector. Also, I have Pand Black and White Poly Film encolsing the area in my closet. I will be doing SOG grow with about 36 plants in 1gallon grow bags. I have a small fan to circulate the air. I have a small 4" passive intake that will bring in air from the a/c'ed room of my bedroom. I will be using carbonated water during flowering to increase the co2 as well.

My question:

Will the carbon scrubber with the built in fan be able to a) exhaust the heat from the light and b) take care of the odors?

I am releasing the exhausted air from my closet to my main living room. I have a DIY bucket with soil moist, water, a fan and ona gel to clear any remaining smells in the place.

My main concern is will the carbon scrubber and fan exhaust the hot air within the closet effectively?

any help would be greatly appreciated.

regards
:1help:
 
FreezerBoy

FreezerBoy

Was blind but now IC Puckbunny in Training
Veteran
While 240 CFM seems enough, that's an axial fan. It's the design least capable of dealing with any kind of back pressure such as scrubbers provide.

All you can do is punch another 4" intake hole, fire it up and find out. You want AT LEAST two 4" intakes. With an axial you may want three to four 4" intakes.

 
S

switch-one

Member
HEY

HEY

FreezerBoy said:
While 240 CFM seems enough, that's an axial fan. It's the design least capable of dealing with any kind of back pressure such as scrubbers provide.

All you can do is punch another 4" intake hole, fire it up and find out. You want AT LEAST two 4" intakes. With an axial you may want three to four 4" intakes.

Click to expand...

Well i was thinking if this is a problem i could replace the axial fan with a squirrel cage faan 465cfm. my question would be would i riun into any problems if i got a a 465cfm fan with this scrubber? secondly, would i be able to use the axial fan to bring in more fresh air from the other room (ac'ed air)?

thanks
 
FreezerBoy

FreezerBoy

Was blind but now IC Puckbunny in Training
Veteran
switch-one said:
Well i was thinking if this is a problem i could replace the axial fan with a squirrel cage faan 465cfm. my question would be would i riun into any problems if i got a a 465cfm fan with this scrubber? secondly, would i be able to use the axial fan to bring in more fresh air from the other room (ac'ed air)?

thanks
Click to expand...

All filters fail eventually. Exceeding the filters rating will accelerate that failure. How soon? Hard to say. Maybe half as long as normal, it could fail on day one. If I had to replace the axial with something else, I'd match the CFM rating. If you go larger, make sure you have spare carbon at hand for emergency re-fills.

I do Venting For Dummies. 3 equal sized holes; two intakes at bottom, one powered exhaust at top, the end. If you want to play with intake fans you're on your own. While they don't guarantee positive pressure they're the ONLY way to get there. Positive pressure bad.

Ventilation for Non-Dummies can be found here: Ventilation 101
 
S

switch-one

Member
only problem is that i already got the scrubber and fan from foothills. I feel stupid b/c i didn't do my research on the axial fans. yea i know. :wallbash:

thats why i was thinking of getting the cage fan for 169.00 and hooking it up to my scrubber that i have now. my concern is heat and odor, naturally.
 
foolish fool

foolish fool

Member
ah I'm sorry, stoned...missed the 'recently installed' part. I was quick to post because I was just looking at the foothills and that was the conclusion i came to.
 
S

switch-one

Member
no worries at all. thanks for your input. wish i would have got that deal from hgtsupply.

i guess im in a bind. i really thought this scrubber and 240cfm fan would have worked for me. when i turn it on how much air pressure am i suppose to feel being sucked in? i feel light air being pushed through the scrubber....i would like to avoid getting another fan but if i have to i will....
 
S

switch-one

Member
FreezerBoy said:
While 240 CFM seems enough, that's an axial fan. It's the design least capable of dealing with any kind of back pressure such as scrubbers provide.

All you can do is punch another 4" intake hole, fire it up and find out. You want AT LEAST two 4" intakes. With an axial you may want three to four 4" intakes.

Click to expand...


if i punch 4 intake holes into the grow room, do you think any odors will leak?
 
FreezerBoy

FreezerBoy

Was blind but now IC Puckbunny in Training
Veteran
Fire it up first and see what happens. I started with a single intake with a 150. Graduating to a 250 turned the cab into an Easy-Bake Oven until I added a second intake. Adding a proper scrubber sent me back to oven temps till I dumped the axial for a mixed vent S&P.

I've got dual intakes now and my fan seriously ramps up and down every time I close or open the door. I'd have gone 3X years ago but, dual steel layers make cutting a hole an all day job. I've never tried 4 but, there are those here who swear by it. I just wouldn't try it with less than two
 
S

switch-one

Member
FreezerBoy said:
Fire it up first and see what happens. I started with a single intake with a 150. Graduating to a 250 turned the cab into an Easy-Bake Oven until I added a second intake. Adding a proper scrubber sent me back to oven temps till I dumped the axial for a mixed vent S&P.

I've got dual intakes now and my fan seriously ramps up and down every time I close or open the door. I'd have gone 3X years ago but, dual steel layers make cutting a hole an all day job. I've never tried 4 but, there are those here who swear by it. I just wouldn't try it with less than two
Click to expand...


sorry for my lack of understanding but what is a mixed vent S&P?

so you really think the axial fan will be ok? I mean im in a position where i cant let anyone know esp the odor. Gotcha on the 3 intakes. any suggestion on the size? I have a 8" exhaust hole where my axial fan is inserted.

thanks for your help i really appreciate it
 
FreezerBoy

FreezerBoy

Was blind but now IC Puckbunny in Training
Veteran
switch-one said:
sorry for my lack of understanding but what is a mixed vent S&P?
Click to expand...

Fans come in different types. Axials, Centrifugal such as squirrel cage (Dayton) or inline(Vortex) and mixed vent (S&P)

Axials suck most and centrifugals suck the least UNTIL back pressure comes into play. Then the axial becomes useless and the centrifugals kick ass. Unfortunately, centrifugals are SCREAMING loud, like under the rocket at liftoff loud. Mixed vents are the a happy compromise. They won't suck like a centrifugal but, they're almost quiet enough to use without muffling.

869adc5f.jpg



Ventilation 101 Great Inline Fans (S&P)

The S&P link is for funsies. Consider the 101 link to be required reading.
 
S

switch-one

Member
ok i figured out the s&p vent fan......

any more input from anyone using this fan in a closet grow would be great....i found someone saying they used one in a closet with my dimesions and a 400hps but i cant find that thread......but anymore input would be great
 
FreezerBoy

FreezerBoy

Was blind but now IC Puckbunny in Training
Veteran
I believe I mentioned his feedback in another thread. Again, we're talking after purchase here. All you can do now is fire that puppy up and see what happens. If it doesn't do right by you, put his feedback reputation to the test.
 
C

CoffeShop

New member
Hey Switch-one,

I was thinking about getting the same foothill filter you got... My grow is still a paper project. FreezerBoy told me the same thing, but what made me back out was not the lack of CFMs. But the noise 58dB. And the fact that being an axial, which makes it have problems with back pressure made me think about durability of the fan.

I don't know the filters but I think when they say 240CFM they mean the combo can do it. Not the fan is a 240CFM attached to a filter (which will reduce the CFM rate of the fan)

The S&P that freezer showed me seemed much more robust and people say it is quiet for little cabinets.

I am now thinking in buying a S&P TD-150 (running it in low) or a S&P TD-125 (running it in max) and a 200-300CFM filter from foothill (just the filter).

And another thing, and please correct me if I am mistaken. You grow area will be a little more than 63 cubic feet, right ? With 240CFM you would be exchanging the air 3.77 times per minute. Unless you are in an area where you have low room temperature, and the heat from your 400HPS is desirable I think you may run into way higher temperatures within the grow than in the room.

I am not that experienced. Won't argue with anyone about it but it is my impression.

How loud is the noise of your foothill filter, right now ???
 
S

switch-one

Member
hey

hey

CoffeShop said:
Hey Switch-one,

I was thinking about getting the same foothill filter you got... My grow is still a paper project. FreezerBoy told me the same thing, but what made me back out was not the lack of CFMs. But the noise 58dB. And the fact that being an axial, which makes it have problems with back pressure made me think about durability of the fan.

I don't know the filters but I think when they say 240CFM they mean the combo can do it. Not the fan is a 240CFM attached to a filter (which will reduce the CFM rate of the fan)

The S&P that freezer showed me seemed much more robust and people say it is quiet for little cabinets.

I am now thinking in buying a S&P TD-150 (running it in low) or a S&P TD-125 (running it in max) and a 200-300CFM filter from foothill (just the filter).

And another thing, and please correct me if I am mistaken. You grow area will be a little more than 63 cubic feet, right ? With 240CFM you would be exchanging the air 3.77 times per minute. Unless you are in an area where you have low room temperature, and the heat from your 400HPS is desirable I think you may run into way higher temperatures within the grow than in the room.

I am not that experienced. Won't argue with anyone about it but it is my impression.

How loud is the noise of your foothill filter, right now ???
Click to expand...

thanks for the input. the foothill filter is not loud and relatively acceptable. i really enjoyed its noise level, thats one of the reasons i was eager to buy it, heh.

Concerning the temps, my ambient temps are in the low 70's or 20's. i have my ac running all day @ 65/66 F.

I am trying to think whether i ought to buy a squirrel fan now (245cfm) or to get a S&P......

sorry for my ignorance but what did you mean by 240cfm as a combo?
 
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