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Old 11-30-2009, 02:03 PM   #1
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Furnace filter brands to avoid?


I am planning to replace a disposable furnace filter with a permanent washable electronic type. The furnace manual states that a permanent filter replacement must only allow maximum airflow of 600 fpm.

My current filter is a disposal Flanders and it has no rating or merv info on it. It came with the furnace which was installed this month. The dealer seems to think any filters are acceptable if they are correct size.

I am hoping to purchase a permanent filter that does not have the anitmicrobial agents embedded in it. 3M seems to have the type I want, but I have seen negative comments about 3M filters.

Can anyone tell me what are the main problems with 3M filters.? I also have heard they use a different rating than is normally accepted.
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Old 11-30-2009, 04:16 PM   #2
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Furnace filter brands to avoid?


They are too restrictive.

Use a general pleated filter. MERV 8 at most.
Don't use any of the electrostatic air filters. They are also too restrictive.
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Old 11-30-2009, 05:37 PM   #3
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Furnace filter brands to avoid?


Merv 8 or 10 is good. But you should have a tech check the air temp rise thru the furnace if using a Merv 10 and change it regularly. The replacement media for those plug in electrostatics is ridiculously expensive and the unit breaks easy. We stopped selling them. The other washable type are difficult to keep clean and I doubt if you can ever wash them back to as clean as new. 3M rates theirs in microns which is not illegal but confusing as the industry standard is MERV.
http://www.filterair.info/articles/a...A98EE04B0DD02B

google:merv

Last edited by yuri; 11-30-2009 at 05:41 PM.
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Old 11-30-2009, 07:59 PM   #4
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Furnace filter brands to avoid?


Thank you both. I will get a pleated type. Regarding the electrostatic ones to stay away from, is that just the permanent ones to avoid? Are the disposable pleated electrostatic acceptable?
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Old 11-30-2009, 08:35 PM   #5
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Furnace filter brands to avoid?


There are 2 types of "electrostatic" filters. The permanent washable type which are restricitive and impossible to get totally clean. They supposedly use the air passing thru their special material to create a electrostatic charge. I have never found them to work very well and they are difficult to keep clean. The plug in type uses a small electric power transformer and a thin wire to the filter to energize it. The replacement membrane/pad is very expensive, the power connection breaks easily and they are restrictive. Disposable accordion type filters are the best.
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Old 11-30-2009, 08:43 PM   #6
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Furnace filter brands to avoid?


I am planning to get a pleated type with a 7 or 8 MERV, but the details of the Kimberly Clark brand indicates the pleated style is electrostatically charged. Is that okay for a disposal filter?
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Old 11-30-2009, 09:01 PM   #7
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Furnace filter brands to avoid?


"Electrostatically" is nothing more than a clever marketing buzzword to charge more $$ to unsuspecting consumers. 3XX brand is very good at that. Static electricity occurs when it is dry and you rub your feet on carpet, how can they "charge" a paper filter? Just like "new and improved". The MERV rating is all you need.

Last edited by yuri; 11-30-2009 at 09:06 PM.
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Old 11-30-2009, 09:27 PM   #8
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Furnace filter brands to avoid?


Thanks for the info. The brand I was looking at was a Kimberly Clark pleated style which is formulated from some type of synthetic material. I didn't necessarily want the "electrostatically charged" feature, but apparently it comes with that feature. I am hoping the MERV 7 rating will not have too much of a "pressure drop" since it is going to be installed in a furnace as an alternative for a permanent type which I assume would normally have a very low pressure drop. There sure seems to be a lot of detail involved in furnace filters. I just don't want to damage a new furnace.
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