Speaker / Filter Foam

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Our high-capacity foam filters dust, allergens and other debris from central heating and air conditioning systems while maintaining airflow around the captured particles. It is also used as speaker foam due to the high air-flow its structure allows. This foam is dark charcoal in color.

Both 30 PPI (Pores Per Inch) and 10 PPI (Pores Per Inch) foam products are available.

NOTE: Not tested for use in aquariums.

Custom Cutting is Available!
We can cut custom sizes of speaker/filter foam for any project you may have! Please Contact Us for details.


A reticulated, open-pore, flexible, ether-type of polyurethane foam. Speaker foam is characterized by a skeletal structure of strands which provide a constant 97 percent void space and a very high degree of permeability.


Filters: Small engines, air compressors, hair dryers, face masks, vacuum cleaners, air conditioning, school and motel ventilators, oil-mist eliminators, automotive air cleaners, industrial panels, electric equipment, projector equipment and dust bag collectors
Coalescing: Separation of water from gasoline, perchlorethylene and jet fuel
Noise Suppression: Microwave covers, aircraft, industrial vacuum cleaners and high intensity sounds
Miscellaneous: Powder puffs, floor scrubbing pads, filters in hydraulic lines, lint-free wipers, pre-filter for liquid filter, paint brush applicators, blackboard erasers and foundation for ceramic and metallized high-tech filters

Resources Notes

Manufacturing Tolerances
Products may carry a size tolerance depending on the style and job. Please see our Tolerance Table.

Standard Sheet Sizes/Quality
Standard sheets of foam are cut slightly larger than the listed size to compensate for shrinkage during packaging, transit, and delivery. Sheets may contain rough edges. Any yellowing/discoloration present is a byproduct of exposure to light during production and manufacturing and does not represent a flaw, damage, or defect in the material.

Write a Review

Excellent for mascots!
Stefan | February 8th, 2023
I bought this foam @ 30 PPI to create the body, arms and neck of a large mascot costume. It works great! It's lightweight and "breathes," which is always important. Covered in a sports mesh and re-enforced with wiring, it's a great choice. Shipping was fast and the foam was immaculate. Just a "heads up" that it will shed a bit from the cut made at the factory, but it's a very minor inconvenience. Well worth it!
Several uses not just speaker foam
Ken McGuire | June 6th, 2022
I purchased this foam because I need replacement filters for my old-style furnace spray humidifier. Foam Factory has provided me with other super products in the past and this is just as exceptional.
Four Stars
Nick | May 19th, 2022
Used as speaker foam. Sheet arrived tightly folded and packaged, leavi g subtle marks when unfolded. Definatelt subdues the high frequencies.