I see this filter: http://www.ebay.com/itm/Holmes-Bion...t=LH_DefaultDomain_0&var=&hash=item2ecacc88a8
I also see this filter: http://www.amazon.com/Carbon-Filter...sorber/dp/B005C5HUI8/ref=cm_cr_pr_product_top
The latter says it's activated carbon, while the former says it's a pre-filter. The filters look similar to me, I'm confused.
Are they the same filter and would both of them work? Are they both pre-filters with activated carbon?
What trapping efficiency can I expected from a pre-filter?
I'm building a fume extractor using a 12V 120mm PC fan, and could not decide which filters actually work and are used.
I also see this filter: http://www.amazon.com/Carbon-Filter...sorber/dp/B005C5HUI8/ref=cm_cr_pr_product_top
The latter says it's activated carbon, while the former says it's a pre-filter. The filters look similar to me, I'm confused.
Are they the same filter and would both of them work? Are they both pre-filters with activated carbon?
What trapping efficiency can I expected from a pre-filter?
I'm building a fume extractor using a 12V 120mm PC fan, and could not decide which filters actually work and are used.