Package of two commercial grade 203369 prefilters for F300, F50F, F58F. We measured the size at 12½ x 20 x 5/16. Two of these prefilters are used in the Honeywell 20 x 25 air cleaners.
Only one prefilter is needed for the 20 x 12½ air cleaners.
These prefilters are a genuine product of the Honeywell Commercial Air Products Division. Commercial products have higher standards for design, assembly, procurement, and production. Prefilters generally do not wear out. Often replacement is needed because over time the woven aluminum foil corrodes and pieces flake off.
Fits the F300E1035, F300A2025, F50F1065, F58F1000 F300A2012, F300B2012, F50F1040 and F50F1057 air cleaner.
This 203369 prefilter is for the F300E F300A F50F F58F and will NOT fit the the F50A or F50E Series. See below for more info.
203369 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.
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.
Prefilter and Postfilter Upgrade
F50 F300 Cell & Filter Reference