18 × 18 Filters | McMaster-Carr

Filter by

HVAC Filter Trade Size

System of Measurement

Inch

Thickness

1/2"

MERV Filter Rating

Filter Type

Frame Material

For Removing

Maximum Temperature

Material

Construction

Reusable

Filter Efficiency @ 3 Microns

Air Filter Performance

Prefilter

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

RoHS

For Use With

Specifications Met

Removes Particle Size Down To

Less than 100 μm

Filter Efficiency @ 1 Microns

44%

65%

85%

Support Grill Material

Steel

Frame Gauge

Filter Efficiency @ 0.3 Microns

Certification

For Filter Thickness

22 Products

Heating, Ventilation, and Air Conditioning

Air Filters

Trap dust and debris in HVAC, exhaust, and electronics systems to improve efficiency and air quality

18 products

Air Filter Frames

Hold panel filters as well as filter rolls and pads in place in HVAC systems

4 products