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Honeywell 203373
Honeywell Prefilter Pair Commercial for F50A F50E 10x19¾
Price:$49.00
Package of two commercial grade 203373 prefilters for F50A or F50E. We measured the size at 10 x 19¾ x 3/8. Two of these prefilters are used in the Honeywell 20 x 20 air cleaners. Honeywell packages 2 prefilters per box. These prefilters are a genuine Honeywell residential product.
These prefilters are for the F50A or F50E series and NOT for the F50F or F300 series. Read below for more info.
These prefilters fit:
√ F50E1083 √ F50E1190 √ F50A1124
√ F50E1091 √ F50E1315 √ F50A1165
√ F50E1182 √ F50E1323
The Honeywell 203373 prefilter replaces replaces earlier part number 199664.
Honeywell Commercial Prefilter
Our prefilter is a Honeywell commercial grade prefilter. The commercial prefilter has more layers of expanded aluminum, starting with a noticeably heavier gauge, course grid. The commercial prefilter weighs 33% more, you can not see clear through this prefilter like the residential version.
The commercial prefilter has an exclusive vinyl bonding process so the frame securely grips the mesh. Also the corners of the frame overlap adding more strength. The flimsy residential prefilter twists and flops when handled, the commercial version is ridged.
We purchase these prefilters from the Honeywell Commercial Air Products division. These prefilters are made in Madison Wisconsin. Honeywell residential prefilters are stamped Product of Mexico.

Prefilter Efficiency Improvement
Aprilaire 412 Super Filter Coat increases efficiency and dust holding capacity of prefilters used in electronic air cleaners.
The Super Coat adhesive have a unique viscosity oil in a gel-like straucture. This viscosity oil constantly absorbs dirt particles. As particles are trapped, they recede into the interior of the adhesive, and throught the circulation of the low viscosity oil a renewed impurity absorbing surface is established. This action provides a continuous impurity absorbing surface layer.
The aluminum mesh prefilters will maintain their initial efficiency with periodic applications of RP Super Filter Coat after cleaning. After a period of use of the prefilter, dirt, lint and the original water soluble adhesive coating are easily removed by simply flushing the filter in a stream of water. A new, easily-applied coating of RP Super Filter Coat can restores the filter's superior performance qualities.
Prefilter Washing
When cleaning the prefilter be careful not to flatten down the woven foil. The aluminum weave can be easily flattened with water pressure or when cleaning with a brush. Soaking the prefilters in a tub is recommended.
See your owner's manual for washing instructions.
F50E F50A vs F50F F300 Difference
Choosing a prefilter depends on the model and size. The F50F and F300 use the same prefilters and are available in 4 sizes. The F50A and F50E use a slightly shorter prefilter and are available in 3 sizes.
To determine your model, the photos show the difference is in the power box. The newer F50F-F300 have a full length power box because the contacts for the cells are built in to the power box.
The top-left photo shows the F50A and F50E. The F50A and F50E are identical except the F50E had been enhanced with an air flow sensor built in to the power box.
The lower-left photo shows the F300 and F50F model. Note the F50F and F300 are identical except for paint color.
 The F300E was manufactured with a plastic access door from 2000 through 2005. This door and alll parts are interchangeable with all F50F and F300. The plastic door was the same as used in the F200E without RF (airwatch indicator).
Honeywell Prefilter Sizes |
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F50A/F50E Series Difference from F50F/F300E

Photo shows an F50F series frame with both an F50F prefilter and an F50A prefilter. The F50A prefilter is shorter than the F50F prefilter. To reduce the need for residential distributors to stock a prefilter for both models, Honeywell made the F50A prefilter universal. The F50A prefilter has extender clips that allow it to also fit the F50F series. The photo shows the fit is loose. We stock both prefilters and do NOT recommend using the universal F50A prefilter in the F50F.
This information is provided because you may have noticed your F50F manual lists the 203373 prefilter as the replacement. The nice fitting prefilter that came with your F50F was the 203370. The 203373 would fit the F50F loosely.
If you have the F50A or F50E, then the 203373 is a good fit.
Prefilter and Postfilter Upgrade
F50 F300 Cell & Filter Reference
Perm20e20c
Permatron Carbon Filter kit for F50A F50E 20x20
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Perm20e20k
Permatron Prefilter & Carbon kit for F50A F50E 20x20
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