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Filterbuy 21x21x4 Air Filter MERV 11 Pet & Allergy Defense (6-Pack)
✅ In stock
📉 Price recently dropped
D
Grade
Analysis Confidence
63%
Price verified Nov 13, 2026 6:29 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
😐 Weak Deal- 😐Verdict: Weak Deal. Marginal discount. Prices may drop further soon.
- 💰The current price is slightly above the going rate for this product — worth watching for a drop.
- 📉Going back roughly eight months, a more competitive price has not appeared — this stands out as a strong value by recent standards.
- 📈The direction is downward at the moment; if that holds, an even better price may surface — though timing the market is never certain.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
2.95/22
Market Standing
4.71/20
Deal Strength
13/20
Momentum
10/10
📝 Product Overview
🏪 Sold by
Filterbuy
🚚 Shipping
Free Shipping
Product Details
✓UNIVERSAL COMPATIBILITY: 21x21x4 replacement air filters for your furnace, air conditioner, or heat pump enhance HVAC system efficiency and support a healthy lifestyle (actual size: 20.50" x 20.50" x 3.63")
✓MERV 11 PERFORMANCE: Protect your home or business from allergens, pets, and more with MERV 11 synthetic media (comparable with MPR 1200 & FPR 7) that captures 95% of dust without restricting air flow
✓LONG-LASTING FILTRATION: Electrostatically charged media with 8 pleats per foot traps more microscopic particles and lasts 3x longer than fiberglass models (replace every 180 days for optimal performance)
✓SUPERIOR CONSTRUCTION: Easy installation beverage board frames with dual wire backing outperform flimsy cardboard designs by improving durability, preventing warping, and resisting extreme temperatures
✓MADE IN THE USA: Built with industrial-grade, recyclable materials and proudly manufactured 100% in the United States for dependable indoor air quality that is trusted by millions of homes
⚙️ Specifications
Brand
Filterbuy
Material
Aluminum, Plastic, Polypropylene
Product Dimensions
20.5"L x 20.5"W x 3.63"Th
MERV Rating
11
Compatible Devices
Air Cleaner, Air Conditioner, Furnace, HVAC System, Heat Pump
Item Weight
18 pounds
Filter Mounting Type
Slide In
Filter Shape
Square
Max Temperature
200 °F
UPC
717267220811
Product Grade
Replacement Parts
