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Old 12-24-2008, 11:08 AM   #1
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Worth the Switch to Metal/Permanent Air Filter?


I have a 18x24x1 filter that I am thinking about replacing with a permanent filter. It seems like a no-brainer as it would seemingly pay for itself over time.

Are there any drawbacks to metal-filters? If they are a good idea, what brands are the best?

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Old 12-24-2008, 03:46 PM   #2
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Worth the Switch to Metal/Permanent Air Filter?


They have very high PDs, and are generally too restrictive.

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Old 01-12-2009, 09:32 AM   #3
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Worth the Switch to Metal/Permanent Air Filter?


What is PD?

Any knowledge on the "BoAir" -it seems to be the one that comes up most when looking at electrostatic washable filters.
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Old 01-12-2009, 06:35 PM   #4
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Worth the Switch to Metal/Permanent Air Filter?


Quote:
Originally Posted by pcampbell View Post
What is PD?

Any knowledge on the "BoAir" -it seems to be the one that comes up most when looking at electrostatic washable filters.


pd = pressure drop

Which is HVAC jargon used to descibe the back pressure the filter imposes on the blower fan. It is the pressure difference across the filter. The more resistance the filter has the higher the PD the higher the backpressure the harder the fan has to work to move the same amount of air. If the filter is too restrictive, depending on the blower, it could cause reduced airflow or higher energy usage trying to force the air through the filter. Typically the cheap blue fiberglass filters are the least restrictive and have the lowest PD, however they are not the the best filters for removing dust or pollen.

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Last edited by key1cc; 01-12-2009 at 06:37 PM.
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