I had difficulty when replacing my filters. The size required is very difficult to slide in without damaging some of the its' shape. These slide in easily as they are made a 1/8 to 1/4 inch less on width and thickness than actual slot. First time in 7 years with my (at the time brand new) furnace. Seriously very happy I found Filter Buy! I'll be purchasing more.
I purchased three filters 16X25X4 MERV 11. I removed a Honeywell filter from my furnace to be replaced by your filter. I compared the physical dimensions and noticed your filter is smaller and loosely fits in my furnace unlike the Honeywell that fits snugly. I would like an explanation prior to ordering additional filters. Thank you, Larry