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Filterbuy 21x21x5 MERV 13 HVAC Air Filter (1-Pack)

Filterbuy ★ 3.6/5 · ItemOracle Score Mid-Range

$86 USD
Price subject to change
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Filterbuy 21x21x5 Air Filter MERV 13 Optimal Smoke & Allergy Defense (1-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement for Rheem, Ruud, & Protech (Actual Size: 20.63 x 20.63 x 4.38)

21x21x5 air filter with MERV 13 synthetic media for dust and germ defense. Improves HVAC efficiency and air quality; many users cite easy installation and good value

Highlights

  • MERV 13 filtration
  • actual size close to 21x21x5
  • easy installation

Pros

  • MERV 13 filtration for dust and germs
  • Synthetic media with good airflow
  • Easy installation reported by customers
  • Well-made, high-efficiency build quality
  • Fits multiple furnace/AC brands

Cons

  • Fit and durability perceptions vary among customers
  • Some concerns about compatibility sizing

Best For

  • home furnace filter replacement
  • air conditioner/heat pump filtration
  • allergen reduction for households
  • dust control in living spaces
  • replacement for Rheem, Ruud, & Protech units

Features

  • Actual size 20.63 x 20.63 x 4.38 inches and 21x21x5 fit typical HVAC slots
  • MERV 13 synthetic media captures fine particles without restricting airflow
  • Electrostatically charged media with 11 pleats per foot delivers lasting filtration
  • USA-made construction with beverage board frame and dual wire backing for durability
  • Compatible with Rheem/Ruud Protech models PD540018 and 540012

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