| Fits Research Products Model No. 5000 (Part #501)|
- New fire resistant Aprilaire 501 filter!
- Original accordion type design.
- Space Gard is also known as Aprilaire Furnace Filters.
- Reaches 99% efficiency on particles 5 microns or larger.
- Protects heating and cooling equipment.
- Reduces dust buildup.
- High efficiency filter media collects small dust particles before they can collect on your coils.
- This product is listed and rated by Underwriters Laboratories as U.L. Class 2.