Typical/recommended MERV Ratings? - HVAC - DIY Chatroom Home Improvement Forum

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Old 09-23-2009, 10:34 AM   #1
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typical/recommended MERV ratings?

I posted previously asking about electronic air cleaners, and now have a related question RE air filtration. My HVAC installer has said that instead of the electronic air cleaner we could go with a MERV 9 4" filter setup, or if I wanted to go up to a MERV 13 4" filter setup. I understand what MERV ratings are and mean, but am wondering what is a typical rating used in a residential single family situation?

Is 13 overkill?




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Old 09-23-2009, 11:02 AM   #2
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Depends on how small particles you want to filter. Personally, I use Merv8 in my house.


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Old 09-23-2009, 02:41 PM   #3
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Your A/C coil when in cooling mode and wet, is a MERV of 8.
So a filter of a MERV 8 is ok.

If you go to a MERV rating higher then 10, you want a 5" media filter, to help prevent loss of air flow.

Your contractor should check your systems static pressure before installing any media air filter.
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Old 09-23-2009, 02:58 PM   #4
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Beenthere is right, and we use MERV 10 5" filters on 90% of our jobs with no problems. Anything higher than a MERV 10 and I would want a ECM Variable speed fan not a basic PSC type. A ECM can produce a higher static pressure and maintain it without overheating the motor.
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