Replacement Filters

Purchase a selection of air filters directly from our site.

Field Controls FlexFilter

Field Controls FlexFilter 16x25x4 / 20x25x4 MERV 11 Air Filter


The patented FlexFilter™ from Field Controls is an ultra compact, easy-to-assemble media air cleaner that replace at least 25 of the most popular models. With seven high efficiency MERV 11 models to choose from, stocking, storing, shipping, and installing media air cleaners just got a whole lot easier.

  • Actual size: Flexible between 16 x 25 x 4 (in.) and 20 x 25 x 4 (in.)
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Why Choose Summers & Zim’s

Why should you trust the plumbing professionals at Summers & Zim’s for all your residential plumbing needs? At Summers & Zim’s, we pride ourselves on our good natured disposition, unmatched plumbing experience paired with numerous certifications and focus on providing our customers with exceptional service and personalized plumbing repair and installation solutions. We’re proud to be certified by the Master Plumbing License, North American Technician Excellence, Inc. and the Environmental Protection Agency.

With our dedication to our customers, we also ensure consistent quality and satisfaction with our one-of-a-kind 5 Point Guarantee:

5-Point Guarantee

  • Design Guarantee

    For all of our repairs and installations, we guarantee it will perform as intended. If it’s not what you expected, we’ll make adjustments or replacements at no extra cost.

  • No Lemons Guarantee

    If you have a recent plumbing fixture installed and a piece of it fails to perform reliably, we’ll install a new one at no additional cost.

  • $500 No Frustration Guarantee

    If your new plumbing installation does not perform as promised or expected within the first two years, we’ll pay you $500 for the inconvenience.

  • Home Protection Guarantee

    While working in your home, if our team accidentally damages any part of your home, we will cover any repair or replacement costs.

  • 100% Money Back Guarantee

    If your new system installation does not meet your needs or expectations, we’ll remove the item and return 100 percent of your investment.