Frequently asked questions


Q: Are the filters disposable?
A: The aluminum filter frame is permanent. The filter material that is placed into the frame is disposable.
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Q: How often do I need to change my furnace filter?
AThat depends on which type of filter material is chose.  Filter refills last between 30 - 90 days.
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Q: What is a MERV rating?
A: MERV stands for the Minimum Efficiency Reporting Value, and is a measure of a filter's worst-case   efficiency performance. The higher the MERV rating, the more efficient the filter.
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Q: How do I know which way to insert my refills ?
A:See our How To Video pageThe Biosponge and Biosponge Plus material has a writing across one side of the filter, this will be facing you when you place the material into the frame.  The pleated refills,(Microsponge, BioPleat, or PurePleat) will have the wire backing against the mesh of the frame, and the white pleat is facing you.

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Q: The electrostatically charged screen has become dirty (spots, looks like imbedded debris) and I would like to know what cleaning solution (409, Clorox, etc.) I can clean the screen without disturbing its purpose. Also, can I take a brush to it with the solution?
A: You can use any household cleaner, like 409, or Fantastic.  Just spray on, let it sit 5 minutes, and hose it off.  You can also lightly brush it if necessary.


Q: How do I know what size air filter I need?
A: See our measurement guide
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Q: What can be the consequences if a furnace filter is not replaced?
A: A furnace filter left in place past its effective replacement time can become clogged by trapped dust and debris thereby restricting airflow, which can lead to furnace damage. It is therefore necessary to ensure timely replacement of the filter.
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Q: Which way should the air flow?
A: The air should flow according to direction shown on the air filter's label.

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Q: Do you offer a reminder service?
A: Yes. Sign up for our free filter reminders!
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Q: Do you guarantee your AC Filters and Furnace filters?
A: Yes.  We guarantee our AC Filters and Furnace filters for 10 years from date of purchase.
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Q: Do more efficient filters require me to retrofit my system to make them work?
A: No. Genuine Air Sponge filters for your furnace are 3/4 inch deep, and will slide into your existing filter track.
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Q: I am using a standard cardboard frame fiberglass filter. Are they effective?
A: No! These type filters are sometimes referred to in the industry as "non-filters." Yes, they will trap some airborne particulate, but not as much as genuine Air Sponge filters.
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