I just replaced the filter in my F200E Honeywell Air Cleaner. Filter is FC200E1037, 20x25. The cleaner is in a Carrier Infinity system. The previous filter was installed six months ago, and the Infinity control said "100% used.
Here is the mystery. When the new filter was installed the static pressure increased! The static pressure with the used filter in place was 0.90 @ 1750 cfm. The static pressure with NO filter in place was 0.56 @ 1750 cfm. The static pressure with the new filter in place is 0.94 @ 1750 cfm !! How can this be?
The Honeywell installation booklet says the pressure drop with newly installed clean filter is 0.20 @1750 cfm. When I installed a new filter six months ago that was the case.
The new filter looks OK, genuine Honeywell part, Infinity system is working OK, old filter is very dirty. Static pressures were from the Infinity control.