Features :
- Nominal Size: 20 x 20 x 4, Actual Size: 19 1/2 x 19 1/2 x 3 5/8 (19.5 x 19.5 x 3.63)
- Attracts indoor allergens, dust, pollen and other airborne contaminants.
- Hypoallergenic and antimicrobial pleated electrostatic filter material
- Nordic Pure recommends changing 4" air filters every 3-6 months
- Made in the USA!
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Item# : SPM14668942632
Model # : 20x20x4a(3-5a8aAtcualaDepth)