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Posted by on September 27, 2006, 6:42 am
powder coat pocke filters are the same sort of filter, they are cheaper
about 32$ for the 20x20 filter.
Hepa filters put a huge strain on a blower as the pores are so small,
never do this one without an experts advice on capacity.
Empressess #124457
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Robert Gammon wrote:
> Commercial/Industrial HVAC filters, aka Bag Filters, are widely
> available, and are no more expensive to purchase than a 20x20x4" filter
> (BTW Honeywell makes 4" filters to fit standard return air grilles).
>
>
> These filters come in 4 standard frame sizes, 12x24, 20x20, 20x24, and
> 24x24. They need ALOT of room behind the filter face as the media is
> 10 to 37 inches deep.
>
> The filter media is 0.15 to 0.25 inches thick. Look at your pleated
> filter, how thick is the material in the pleats?? Thin!! Much
> thinner than this.
>
> Filter media is then 10 to 120 square feet in size!!! a typical
> residential pleated furnace filter 20x24 in size has about 6 sq ft of
> filter in it.
>
> They come in a variety of filter ratings from a number of different
> manufacturers. I have seen Purolator on several web sites. Merv
> ratings climb from 7 to 15. MERV15 on the Purolator models as is the
> case with all fitlers with this rating will capture 95% of the 1 micron
> and larger particles in the air, and the Purolator Defiant and Serva-Pak
> models will capture 80% of the 0.3 micron particles. This is almost HEPA
> ratings (99.97% of 0.3micron particles and up), but at a MUCH lower
> costs. A HEPA filter sized to treat your whole HVAC will cost you
> roughly $2800 to purchase and install. The filter costs about $300 when
> you replace it.
>
> You need the assistance of an HVAC pro to make an adapter for this in
> your return air plenum, and to select a model that will not place undue
> burden on your HVAC fan. This last point is very important as HVAC
> fans are not really designed to pull air thru a filter any more dense
> than MERV 11, and most of them work MUCH better if they have a MERV 7 or
> less filter in them. This is an important point, as the
> filter fitted by the manufacturer is there SOLELY to protect the
> EQUIPMENT, not to protect YOU! You can find models of the 95% filter
> bag that have initial pressure drops roughly the same as a Filtrete
> UltraAllergan. Unlike the Filtrete which may need to be changed every
> 2-3months, this filter will not need to be changed any more often than
> once or twice a year!!
>
> $40 once or twice a year vs $19 or so at least 4 perhaps 6 times a year
> AND you capture ENORMOUSLY more dirt, dust, pollen, mold. Your house
> stays MUCH cleaner.
>
> HEPA will do a better job at filtering, but it costs way more to acquire
> and install and the annual filter replacement is MUCH more expensive too.
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