Honeywell FC100A1045
Honeywell Merv 11 Deep Pleated Media Filter 21½ x 27½
  16 x 20 16 x 25 20 x 20 20 x 25

Genuine FC100A1045 Honeywell media filter. Replacement filter for the model F27F. Measured 21½ x 27½ x 4½ inch. ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) rated MERV 11.

Replaces 203722 used in F27F1032.
The steel frame for this filter is no longer available.


Description 21½ x 27½ Media Air Filter
Aplication Replacement Filter FC100A1045
Dimensions 21½ x 27 in. (546 mm x 699 mm)
Efficiency Standard Efficiency ratings based on ASHRAE Standard 52.2-1999.
Efficiency Standard Efficiency ranges are defined for:
Small particles, E1=0.3 to 1.0 microns,
Medium particles, E2=1.0 to 3.0 microns,
Large particles, E3=3.0 to 10.0 microns.
Franctional Standard E1=25%, E2=62%, E3=85%
Minimum Efficiency Reporting Value
(Media Filters Only)
Static Pressure Drop
(in. w.c.)
0.23 at 500 FPM
Type of Air Cleaner Media Air Cleaner
FC100A1045 is used in F27F1032

F100 versus F200 versus F300

Honeywell uses the same chassis for the F100, F200, and F300. The chassis is made in four sizes 16x20, 16x25, 20x20, 20x25. They all accept the same media filters or can be fitted with electronic cells.

The F100 is the basic model that comes with a filter rated at Merv 11 (FC100A1045). The F100 is available with or without the W8600A wall mount indicator that simply provides a reminder to change the filter based on calendar days. The F100 filter will also fit in the F200.

The F200 model uses the same chassis as the F100 but the access door has a sensor. The F200 door senses the pressure drop across the filter and transmits the status to the W8600B wall mount indicator. The W8600B will indicate a filter change is needed based on the differential pressure drop. The F200 comes with a filter rated at Merv 13. The F200 filter will also fit the F100 model.

The earlier model F35F and F25F also used the same chassis and door as the F100. The F25 and F35 used the current F100 or F200 replacement filters.

BEST 15 TrueCLEAN Air Cleaners   99%
BETTER 12-14 F300E Electronic Air Cleaner   98%  
BETTER 13 F200F Media Air Cleaner   97%  
GOOD 11 F100F Media Air Cleaner 96%    
GOOD 10 FC40R Return Grille Air Filters   86%    
BASIC 1-4 1" Fiberglass Filter 20%      

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