Need help figuring out how to match carbon filter to exhaust fan

[Pinkladyeater]

I have a couple of beginner level questions for all of you.

1. How do you figure out what size of carbon filter/scrubber to use with your exhaust fan?

2. What is the difference if any between a carbon scrubber and a carbon filter?

 

[samba]

1
Get a carbon filter thats about 133% rated compared to fan. The bigger the better as it restricts the fan less.

2
None that I know of.
Theres a ton of different kinds thou...

 

[FreezerBoy]

I wasn't aware of an actual formula but, the filters rating needs to exceed the fans rating. If the filter's rating were smaller, air would move through the filter faster than it could be scrubbed.

 

[Pinkladyeater]

1

Get a carbon filter thats about 133% rated compared to fan. The bigger the better as it restricts the fan less.

2
None that I know of.
Theres a ton of different kinds thou...

Thanks a lot I'll get a carbon filter that is about 133% larger then my fan's cfm rating.

I wasn't aware of an actual formula but, the filters rating needs to exceed the fans rating. If the filter's rating were smaller, air would move through the filter faster than it could be scrubbed.

Thank you FreezerBoy that makes sense since the filter would slow the air's movement. Also, I want to thank you FreezerBoy for answering some of my previous threads as well.



It is people like you two that help us less expericenced folks out. We very much appreciated it too.

 

[burny downz]

As far as question #2 goes, My take on that is: a scrubber is for a recirculating exhaust and a filter is for exit exhaust. Filters seem to be more expensive cuz they work bigger and better.

 

[growclean]

As far as question #2 goes, My take on that is: a scrubber is for a recirculating exhaust and a filter is for exit exhaust. Filters seem to be more expensive cuz they work bigger and better.

This sounds right to me, but essentially you can use a "filter" as a scrubber if you are just not pumping it out of the room I think.

 

[ITryToGrow]

Like everything else, nothing is easy.

It's more to matching a filter to a fan than just making sure the CFM rating of the filter is greater than the fans.

Check out this thread.

A hot tip is to try and find out which fan (make and model) is recommended by the manufacturer of the filter.

Also, you get what you pay for - and freedom has no price.

Buy quality, you won't regret it.

Cheers

 

[stellarcollison]

I wasn't aware of an actual formula but, the filters rating needs to exceed the fans rating. If the filter's rating were smaller, air would move through the filter faster than it could be scrubbed.

I came across the formula for this the yesterday here on the forums. I try to find it again and post the link.

Here's an ex:

S&P TD-100 (high setting) produces 101 CFM @ 0.0" SP

The Can Filter 33 has a max Recirculating (Scrubbing) CFM: 400 cfm / 700 m³h
*use the recirculating CFM, not max exhaust*

Take the fan CFM @ 0.0" SP and divide it by the filter max recirculating CFM.

101/400 = .2525 or .25" SP

The S&P TD-100 (high) will operated @ 0.25" SP when used with the Can Filter 33, producing 57 CFM according to S&P tech spec chart.

FOUND IT:

http://www.icmag.com/ic/showthread.php?t=145545

Page 1, post #5 (Jnugg)

 

[FreezerBoy]

You broke my brain!

Seriously though, that's Cool-O-Mundo! Thanks.

 

[Pinkladyeater]

Like everything else, nothing is easy.

It's more to matching a filter to a fan than just making sure the CFM rating of the filter is greater than the fans.

Check out this thread.

A hot tip is to try and find out which fan (make and model) is recommended by the manufacturer of the filter.

Also, you get what you pay for - and freedom has no price.

Buy quality, you won't regret it.

Cheers

Thanks ITryToGrow that is a very good and informative link you put in your post. I guess where the filter is placed will also determine what size I would need as well.

As far as question #2 goes, My take on that is: a scrubber is for a recirculating exhaust and a filter is for exit exhaust. Filters seem to be more expensive cuz they work bigger and better.

burny downz I wondered if there was a difference because I’ve heard both terms used often and when starting out it can be confusing. I think I’ll go with the filter because I’m concerned about the smell escaping into the room.

I came across the formula for this the yesterday here on the forums. I try to find it again and post the link.

Here's an ex:

S&P TD-100 (high setting) produces 101 CFM @ 0.0" SP

The Can Filter 33 has a max Recirculating (Scrubbing) CFM: 400 cfm / 700 m³h
*use the recirculating CFM, not max exhaust*

Take the fan CFM @ 0.0" SP and divide it by the filter max recirculating CFM.

101/400 = .2525 or .25" SP

The S&P TD-100 (high) will operated @ 0.25" SP when used with the Can Filter 33, producing 57 CFM according to S&P tech spec chart.

FOUND IT:

http://www.icmag.com/ic/showthread.php?t=145545

Page 1, post #5 (Jnugg)

Stellarcollison, this is gold, awesome find. Thank you.


Great posts everyone. There is tones of wonderful information going on in here.