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Originally Posted by LivingLarge
Could someone more knowledgable than I please explain why larger is better? In filters that is 
I was once told by an AC guy that my HVAC system would be better served by the cheap (i mean cheapest) Home Depot air filter. And just change them monthly. No real cost since they were <$1 each. Is it for the system or the person (allergy?)? Those better filters really need a large force of air to pull it through the dense filter? No? |
The 4 & 5 inch filters are often the equivalent of a HEPA filter and protect the AC coil, heat exchanger, and blower motor & wheel from dust along with helping people with allergies and keeping the dust down in the house. Yes they are very dense, however their depth and accordian style makes for a lot more filter area to overcome this density. I would rather see someone use the cheapo filters then see them use the 1" "high efficiency" filters because these filters are very dense but without the extra area necessary to overcome the static pressure.