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About Air Filter Efficiency Ratings
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Compare MERV rating, efficiency, and particle size to find the right filter for your location—from warehouses and offices to hospitals and labs.
Air Filter Pads
Cut these pads to the size you need; frames are sold separately.
All meet UL Classified flame retardance requirements.
Pads with a tacky surface retain particles better than other pads. They are blue on one side and white on the other.
Reusable Air Filter Pads
Wash and reuse these pads. Cut to the size you need.
These pads meet UL 900 flame retardance requirements.
Polyester pads require no frame—rigid polyester is firm enough to be used without one.
Polyester Plastic
| HVAC Filter Trade Size | MERV Filter Rating  | Filter Efficiency @ 3 Microns | Removes Particle Size Down To, microns | Material | Color | Maximum Temperature | Pkg. Qty. | Pkg. | |
1/2" Thick | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 25 × 48 | 5 | 20% | 3 | Polyester Plastic | Blue | 225° F | 1 | 00000000 | 000000 |
| 25 × 48 | 5 | 20% | 3 | Polyester Plastic | Blue | 225° F | 5 | 00000000 | 00000 |
1" Thick | |||||||||
| 25 × 48 | 6 | 35% | 3 | Polyester Plastic | Blue | 225° F | 1 | 00000000 | 00000 |
| 25 × 48 | 6 | 35% | 3 | Polyester Plastic | Blue | 225° F | 5 | 00000000 | 000000 |