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Glasfloss ZL 20x20x4 MERV 10 Pleated Filter (Box of 4)

Glasfloss ★ 4.0/5 · ItemOracle Score Mid-Range

$59.95
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Glasfloss ZL 20x20x4 MERV 10 Pleated 4" Inch AC Furnace Air Filters. Box of 4. Actual Size: 19-1/2 x 19-1/2 x 3-3/4

Filtration filter with actual size 19-1/2 x 19-1/2 x 3-3/4 and nominal 20x20x4. Provides MERV 10 grade filtering; made in the USA. For optimum performance, change at least every 3 months. Customer note: easy to install and fit well in certain spaces

Highlights

  • MERV 10 filtration
  • Actual size ≈ nominal
  • Made in the USA

Pros

  • MERV 10 filtration
  • Actual size close to nominal
  • Made in the USA
  • Easy to install
  • Good value as a box of 4

Cons

  • Some customers report sizing variance
  • Does not fit 4-3/8 inch or 5 inch depth filters
  • May require quarterly replacement

Best For

  • residential furnace filtration
  • commercial HVAC filtration
  • air ducts maintenance
  • replacement in 20x20x4 housings
  • space-constrained filter installs
  • systems requiring MERV 8-11 range

Features

  • Actual size is 19-1/2 by 19-1/2 by 3-3/4 inches
  • Nominal size 20x20x4 with MERV 10 filtration
  • Made in the USA for residential or commercial use
  • Recommended replacement at least every 3 months for best performance
  • Does not fit 5-inch or 4-3/8-inch depth filters; check needed size

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