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Honeywell Prefilter Pair Commercial for F50F F300 10x20
Price:From $49.00 to $250.00
Product Options
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Package of two commercial grade 203370 prefilters for F50F or F300 series. We measured the size at 10 x 20 x 5/16. Two of these prefilters are used in the Honeywell 20 x 20 air cleaners.
These prefilters are a genuine product of the Honeywell Commercial Air Products Division. The Commercial products have higher standards for design, assembly, procurement, and production.
Prefilter Upgrade
Permatron polypropylene filters tests shows 43% increase in average arrestance efficiency over metal mesh prefilter. See Poly-203370 page.
Fits the F300E1027, F300A2020 and F50F1032 air cleaner.
This 203370 prefilter is for the F300E F300A F50F Series and will NOT fit the the F50A or F50E Series. Read below for more info.
203370 Residential Grade Prefilter
Genuine Honeywell residential grade prefilters are available for only $39 while supplies last.
The residential grade prefilters should be handled with care, since they have a weaker frame that can be damaged. Additionally, the mesh can be pulled out of the aluminum frame that holds the mesh like a spring clamp.
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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Prefilter and Postfilter Upgrade
F50 F300 Cell & Filter Reference
203370-R
Honeywell Prefilter Pair for F50F F300 Residential 20x20
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50000293-003
Honeywell Charged Postfilter Pair for F50F F300 20x20
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Perm20f20c
Permatron Carbon Filter kit for F50F F300 20x20
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Perm20f20k
Permatron Prefilter & Carbon kit for F50F F300 20x20
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