Permatron Prefilter Pair for F50F F300E Stainless Frame 12½ x 20

Prefilter Efficiency Improvement

• Filter Coat Adhesive

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.

• Material Safety Data Sheet
• Aprilaire 412 Product Data

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).

Prefilter Washing

• Fiberglass Wash Tub
• CalClean Detergent

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.

• Honeywell Instructions
• White-Rodgers Instructions
• Cell Washing Frequency

Permatron filters are made in Illinois. The foam, activated carbon, poly-propylene, aluminum mesh and steel frame are all products of the USA.

The genuine Honeywell prefilters are stamped with Product of Mexico.