After doing a little research I decided to go with the MERV 12 instead of the ridiculous MERV 16 my system came with and save about $100 on the filter. Many other filters listed as 16 x 25 x 5 are actually 16 x 25 x 4.25, but this one, although I haven't measured the thickness, is the same size as the Lennox filter it replaces. I live in a warm climate and rarely use the heater. Sometimes my stove doesn't heat up for 10 whole months at a time. The air conditioner is used for most of these 10 months. There is never a burning smell when I use my heater like there was with my last system when I used the cheap 1 inch filters.
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