Filter Hut's 20x20x4 rigid cell filters are designed specifically for turbulent air and variable air velocity systems. Our 20x20x4 rigid air filter supplies high efficiency filtration in harsh operating conditions where air quality is critical.
- 20 x 20 x 4 nominal size.
- 19.375” x 19.375” x 3.75” actual size.
- Galvanized metal construction.
- Standardized to ASHRAE 52.2 ratings.
- 3 rigid air filters to a case.
- Also available in non-standard sizes.