Here's another one to watch for, homeowners & techs!
3M Filtrete 16x25x4 media, to replace Honeywell F100 media
Furnace suddenly cycling on limit. Tech read 192° at the limit. Found that the static pressure drop over the new filter was .55" WC. Taking filter out dropped temp at limit to 134°. Static on the genuine Honeywell media was 1/2 that and the furnace didn't overheat.