Changing from electrostatic to HEPA disposable filters.


Old 01-05-17, 04:46 PM
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Changing from electrostatic to HEPA disposable filters.

My high efficiency gas furnace was installed with an electrostatic air filter but the electronic filters have ceased working so I replaced them with a disposable HEPA filter a couple of months ago. After a bit I began to notice a periodic rattle in the furnace. Recently I opened the blower panel and inspected the fan to see if there was something striking it and found nothing. However, I did find that the blower motor housing attaches below the furnace portion with a sort of slide-in connection and is secured with a couple of screws at the front of the housing. I turned the fan manually and did not feel anything like a bearing failure or some sort of grab or hesitation in the fan, However, I found that I could get a rattle when I moved the fan housing slightly. Also, I'd previously suspect that the rattle came from the filters but was never able to reproduce it in that area. I did notice that the rattle stopped when I opened the filter compartment which would partially bypass the filters. So, it seems to me that perhaps the high-efficiency filters may be part of the problem in that the fan may be having to work harder to pull air through the HEPA filters and that's causing it to move. Is this a reasonable supposition? Has anyone else has a similar problem and will changing to a less efficient filter likely solve the problem?

Thanks for your advice.
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Old 01-05-17, 05:23 PM
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I found that I could get a rattle when I moved the fan housing slightly.
Seems to me you found the first thing I'd be fixing. Go with the obvious first!
Old 01-05-17, 05:26 PM
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Welcome to the forums! Like you I decided not to rebuild my electronic air cleaner. Instead I switched to using 5" media filters and left the prefilters in place to catch dog hair, etc before it gets to the media filter. I get 6 months on one filter, easily, but find that I have to clean the pre filters every month by back washing them with the garden hose, or in my basement sink.

HEPA filters are dense, and unless you have really bad health issues, I can see where they would be a burden on the fan motor trying to draw air through it. I have been using FPR 10 filters for a while and get good service from them.
Old 01-05-17, 06:16 PM
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Keep an eye on the furnace burner short cycling when using a filter like that.
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