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?
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.