Have 4 return filters, been using 3 Honeywell merv 10 and 1 brand X special size very low merv #. Attracted by FBC merv13 and step by step define "special size". Second benefit delta pres across filters better balance, low merv# no balance reduced circulation in merv10 returns.
While there was a slight communication problem on my end, it all worked out quite well. The filters were received in good shape and they appear to be working well. Thanks for the help