I am buying media air cleaners for a Five Seasons media air cleaner( Model FSMU 1625) and have a choice of 8 MERV or 11 MERV. I think I understand the concept of MERV but will an 11 MERV restrict the air too much. Thanks in advance for your expertise.
It might,the 8 might ,as well.
Sorry ,no way to tell with testing the static of your system and seeing the ratings for the filters.
In genral,if your adding media filters to a system that wasn't designed for them and you have "ducted" returns ,versus a short thru the wall return,most any media is likely too restritive.