Prefilters | McMaster-Carr

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Filter Efficiency @ 3 Microns

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380 Products

About Air Filter Efficiency Ratings

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 Rolls and Pads

Prefilter Air Filter Rolls

These rolls are an economical choice for protecting more expensive filters that catch finer particles.

Prefilter Air Filter Pads

These pads are an economical choice for protecting more expensive filters that catch finer particles.

Air Filter Pads

Cut these pads to the size you need.

Reusable Air Filter Rolls

Cut these washable, reusable rolls to the size you need.

Reusable Air Filter Pads

Wash and reuse these pads. Cut to the size you need.

Reusable Air Filter Sample Packs

Determine the right pores per inch for your air filtering application—you'll receive several small samples with different pores per inch.

Electronic Equipment Air Filter Pads

Designed for use with electronic equipment, these pads can withstand prolonged exposure to heat and humidity.

Air Filter Rolls for Automatic Roll Machines

Replace the filter roll in your automatic filtering equipment.

Panel Air Filters

Reusable Metal Panel Filters

Also known as metal mesh filters. These filters can be washed and reused.

Quick-Disconnect Reusable Metal Panel Filters

Magnetic strips on the back of the frame make these filters easy to install and remove.

Panel Air Filters

These filters are typically used as replacements in HVAC equipment.

Made-to-Order Panel Air Filters

Create a custom-sized filter or protective layer for expensive filters.