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Old 02-13-2011, 10:05 AM   #31
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what is best furnace filter to buy?


Very informative thread, I've learned quite a bit.

In my apartment I've got an old furnace (manufactured in '86 installed in '91) and just yesterday the ancient washable filter disintegrated on me (cheapskate landlord)when I was washing it, so I had to replace it.

Before reading all of this I headed to the local hardware store to pick up a new one. They had three choices, one which was rated at MERV 11, which I bought and installed. After reading this I'm thinking 11 might be a little high for the old girl. I went back to the store and the filters that were more expensive were the Filtrete ones rated at 1000 (MERV 10 if I understand correctly), and the only other option were the True Blue ones rated at MERV 2. Which of these should I get? Is MERV 10 probably still too high for an older furnace, and will one with a rating as low as 2 present any problems?

Any help appreciated.

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Old 02-13-2011, 10:31 AM   #32
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what is best furnace filter to buy?


I would never use any filter higher than a MERV 8 on any furnace unless it has a powerful ECM motor or large ductwork which lots of people don't have. (tests needing doing to make sure if a higher grade is used). True Blue makes Merv 7 and 8 at HDepot. I buy them there for my neighbor. Also at Canadian Tire in Canada. Merv 7 is good for yer ol gal. 2 is better than nothin but not much better.
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Old 02-13-2011, 11:25 AM   #33
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what is best furnace filter to buy?


Thanks yuri, I will try to find something around 7-8 ASAP. The 2 won't harm the furnace in the meantime will it?
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Old 02-13-2011, 11:27 AM   #34
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what is best furnace filter to buy?


No.....
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Old 02-13-2011, 01:10 PM   #35
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what is best furnace filter to buy?


I couldn't agree more...MERV8 unless there is an ECM motor of sorts to overcome the static pressure
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Old 02-13-2011, 01:48 PM   #36
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what is best furnace filter to buy?


Those see through blue fiberglass air filters were used for a long long time before those 3M came out.

It won't hurt the furnace.
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Old 09-16-2012, 08:55 PM   #37
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what is best furnace filter to buy?


I realize this is an old post but I have had a lot of experience with electrostatic filters. Keep in mind that several manufacturers make electrostatic filters and each has it's own specs and design. Like any filter, there is a balance between dust capture and airflow. I used dusteater brand at home and did not like it...to much resistance. I have also learned to ask my customers if they are good at remembering to change their furnace filters. If they forget for months at a time, I do not recommend any permanent filter. Most of my older customers have a good routine for checking their filter every month. In this case I have found that the boair brand electrostatic filter works very well. It has very low resistance to airflow and traps dust well. The unique thing about boair is it contains 5 layers af thin media and no polyester so it is easy to wah clean. I've been using them in my units at home for about 10 years.

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