Pre-Filters

First line of defense. Protect downstream filters. Save money.

Ships from Kalama, WA
Same-Day Quotes
OEM Quality

Pre-filters are your economical first stage of filtration — they capture larger particles and extend the life of more expensive downstream filters. Positioned before your main exhaust filters, intake pleats, or carbon beds, pre-filters take the brunt of the loading and are designed for frequent, inexpensive replacement. A smart pre-filter program can significantly reduce your total filtration cost.

Key Benefits

  • Extends life of expensive final filters
  • Low cost per replacement
  • Captures large particles before main filters
  • Easy and fast to change
  • Reduces total filtration cost

Common Sizes

20x20x1"20x25x1"24x24x1"Roll media (various widths)Pocket pre-filters

When to Replace

  • • Visible loading or discoloration
  • • Pressure differential increase
  • • Schedule-based (weekly or bi-weekly typical)
  • • Before downstream filters show loading

Frequently Asked Questions

How often should pre-filters be changed?

More frequently than your main filters — that's the point. Weekly or bi-weekly changes are common. The goal is to load the cheap pre-filter, not the expensive final filter.

Do I really need pre-filters?

If your main filters (especially carbon) are expensive, pre-filters almost always pay for themselves by extending final filter life. Calculate the cost per change for each stage.

What efficiency rating for pre-filters?

MERV 4-8 is typical — enough to catch large particles without excessive restriction. Higher efficiency pre-filters can cause premature loading without providing proportional benefit.

What filters do you need?

Select the type and enter dimensions for each filter

Why Order Filters From WERCS?

We're not just a parts supplier — we're the same technicians who service your booths. We know what works and what doesn't.

OEM Quality

Genuine OEM filters when available, or same-grade cut-to-fit alternatives

Cut-to-Fit Service

Custom sizing for any booth configuration — measure and send photos

Warehouse Direct

Ships from our Kalama, WA warehouse — fast delivery, fair prices

Need Help Identifying Your Filters?

Not sure what filters you need? Call us and we'll walk you through it — or book a service visit and we'll handle everything.