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Can-Filter 33, 4" flange ? Etc.

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phrike

Member
Hi,

I just ordered a Can-Filter 33 from http://www.betterthannature.com/ . For whatever reason, their 33 price is a good deal lower than any other Canadian vendor I've see, but other filters are more in line.

The spec page for Can-Filter 33 says "Flange: 4", 6"" : http://www.canfilters.com/canfilters_33.html . But this vendor tells me that only a 6" flange exists, and for 4" and 6"-4" reducer must be used.

Anyone know if there is a direct 4" flange for the model 33 filter ?

Since I'm creating this thread, I'll report on my plans for any comments or suggestions:

I'm building a few CFL micro-cabs for personal use only. One has 1.5 sq ft on left and 1.7 sq ft on right, and another has 1.4 sq ft, so 4.6 square feet total. Around 30 inches height with 6" taken for a homemade light "tunnel", so 24" for the plants until they hit plexi. I have separate fans for lights and plants.

I had originally been thinking of using a few Can-Filter 705s, 2600s or 9000s. But I'd need several and they take space and I don't want ducting, for the most part.

The cabs are in my insulated garage where I smoke/toke. So I'm thinking now I can just scrub the general air in the garage. I'm going to avoid stinky strains and water cure for even more stealth.

So I'm looking to connect the 33 filter to my old 4" Can-Fan. around 100-110 CFM I think. I may try other, smaller quieter fans. I'll just place the assembly near the cabs and my smoking spot. I don't need ULTIMATE smell stealth, but clean air is nice.

One thing I wonder about is minimum CFM rated at 100 CFM for the 33 filter. If I go lower will smell not be removed ?

Also I'm not sure why CFM rating is around 400 for scrub and 200 for exhaust. Why the difference ?

I have a 6" exhaust pipe for my oil furnace right by the spot. I'm thinking in summer, when furnace isn't used, I could hook exhaust to the roof bound pipe to keep garage temps lower. If too hot though I can just take a break from growing in the summer, although my intended perpetual grow method isn't compatible with that.

Thoughts ? Thanks !
 
P

phrike

Member
sanjuan

sanjuan

Member
"One thing I wonder about is minimum CFM rated at 100 CFM for the 33 filter. If I go lower will smell not be removed ?"
No (I think), you just will have more carbon surface area than you need. I like the idea of going with larger filters than necessary--less strain on the fan and so you will likely get greater air flow.

"Also I'm not sure why CFM rating is around 400 for scrub and 200 for exhaust. Why the difference ?"
Scrubbing in this context means recirculating the air. An exhaust filter only gets one chance to clean the air.
 
P

phrike

Member
sanjuan said:
"One thing I wonder about is minimum CFM rated at 100 CFM for the 33 filter. If I go lower will smell not be removed ?"
No (I think), you just will have more carbon surface area than you need. I like the idea of going with larger filters than necessary--less strain on the fan and so you will likely get greater air flow.

"Also I'm not sure why CFM rating is around 400 for scrub and 200 for exhaust. Why the difference ?"
Scrubbing in this context means recirculating the air. An exhaust filter only gets one chance to clean the air.
Click to expand...

Thanks SanJuan. Your last sentence made me understand. Exhaust COULD run at 400 CFM but there might be some smell escaping because the stinky air doesn't have enough carbon contact time, so 200 CFM is best for a maximum exhaust flow.

At 400 CFM when scrubbing/recirculating, the stink may not be sufficiently removed in one pass, but scrubbing allows multiple passes to remove the stink. Makes sense now.


But minimum airflow still befuddles me. The specs for Can-Filter 33 say "Recommended Min Airflow: 100 cfm". It's not clear though if the recommendation has some technical reason, or if it just indicates lower airflows can be more inexpensively handled by a smaller filter.

If CF Group gets around to answering my email I'll pose these questions and report.
 
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Admiral Canna

Member
If you maintain negative pressure (ie....your fan is slighly oversized for your room) ALL smell will go through filter.

Why don't you wanna run 6" duct? Far more efficient than 4" duct. At some point you will add another light....everyone does....so why not be planning for that now?
 
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phrike

Member
Vendor, Craig @ BetterThanNature replied:

"
I asked our retail guys again and they said that the reducer is by far the best way to go and that is why they don’t stock the 4” flange.
"

Seems weird. CF Group makes an inefficient 4" flange ? Or vendor excuse for no stock ?
 
P

phrike

Member
Admiral Canna said:
If you maintain negative pressure (ie....your fan is slighly oversized for your room) ALL smell will go through filter.

Why don't you wanna run 6" duct? Far more efficient than 4" duct. At some point you will add another light....everyone does....so why not be planning for that now?
Click to expand...

Hi Admiral Canna.

I'm not building a grow room; that and my old 400 watt HID freaks the wife out.

I'm building some CFL micro-cabs of a few square feet. So I'm not thinking of ducting, except perhaps for my idea of using the existing 6" chimney duct in the heat of summer, which may never come to pass.

My plan is just to exhaust the air in the garage the cabs are in, and scrub the garage air where I also smoke. As a bonus, it will help heat my garage in winter by keeping the warmed, yet scrubbed, air inside.

I think the Can-Filter 33 is overkill for these cabs, but it will clean my garage/shop/smoke area too.

The most powerful fan I have is an older 4" CanFan my grower buddy gave me some years back. That fan has always been overkill for me, and likely always will IMO. But it's a perfect match for the 33 filter, albeit somewhat loud.
 
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