---
product_id: 561638348
title: "Filterbuy 21x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 20.50 x 21.50 x 0.75 Inches)"
price: "₨6953"
currency: SCR
in_stock: true
url: https://www.desertcart.sc/products/561638348-filterbuy-21x22x1-air-filter-merv-13-optimal-defense-4-pack
store_origin: SC
region: Seychelles
---

# Filterbuy 21x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 20.50 x 21.50 x 0.75 Inches)

**Price:** ₨6953
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Filterbuy 21x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 20.50 x 21.50 x 0.75 Inches)
- **How much does it cost?** ₨6953 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/561638348-filterbuy-21x22x1-air-filter-merv-13-optimal-defense-4-pack)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00CJZ7WS2 |
| Air Filter Construction | Pleated |
| Best Sellers Rank | #479 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #22 in Furnace Filters |
| Brand | Filterbuy |
| Brand Name | Filterbuy |
| Common Applications | Allergen Reduction, Antimicrobial, High Strength |
| Compatible Devices | Air Cleaner, Air Conditioner, Furnace, HVAC System, Heat Pump |
| Customer Reviews | 4.6 out of 5 stars 21,479 Reviews |
| Included Components | Air Filters |
| Item Dimensions L x W x Thickness | 21.5"L x 20.5"W x 0.75"Th |
| Item Height | 0.75 inches |
| Item Type Name | Air Filter |
| MERV Rating | 13 |
| Manufacturer | Filterbuy |
| Material | Aluminum, Plastic, Polypropylene |
| Material Type | Aluminum, Plastic, Polypropylene |
| Max Temperature | 200 Degrees Fahrenheit |
| Max Velocity | 615 Cubic Feet Per Minute |
| Model Number | AFB21x22x1M13pk4 |
| Number of Items | 1 |
| Product Dimensions | 21.5"L x 20.5"W x 0.75"Th |
| Product Grade | Replacement Parts |
| UPC | 717267055925 |
| Unit Count | 4.0 Count |
| Warranty Description | Defective items and products that were shipped incorrectly are subject to a refund or replacement on a case by case basis. Please contact our customer support team for more information if you experience any issues. |

## Product Details

- **Brand:** Filterbuy
- **Material:** Aluminum, Polypropylene, Plastic
- **Product Dimensions:** 21.5"L x 20.5"W x 0.75"Th
- **MERV Rating:** 13.00
- **Compatible Devices:** Heat Pump, Air Conditioner, Air Cleaner, HVAC System, Furnace
- **UPC:** 717267055925
- **Number of Items:** 1
- **Manufacturer:** Filterbuy
- **Product Grade:** Replacement Parts
- **Unit Count:** 4.0 Count

## Images

![Filterbuy 21x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 20.50 x 21.50 x 0.75 Inches) - Image 1](https://m.media-amazon.com/images/I/816PAX-1tyL.jpg)

## Questions & Answers

**Q: Why should I change my air filter?**
A: To maintain a healthy lifestyle, as breathing dirty air can put you at risk to develop asthma, allergies, and other respiratory ailments. Plus, old filters can cause system defects which may lead to unwanted expenses via energy costs and repairs.

**Q: When should I change my air filter?**
A: We generally recommend replacing your filter every 90 days to keep your system running efficiently and air clean. But this is subject to change based on filter size and variable factors for pet owners, allergy sufferers, homes with children, etc.

**Q: Will these air filters fit my system?**
A: Most of our filters are universally compatible and will work with any furnace, air conditioner, heat pump, or HVAC system as long as you choose the proper size. But if you see a specific brand name on a listing, make sure it matches your unit model.

**Q: How many air filters do I need?**
A: This varies for every customer depending on specific needs such as the number of vents in your home. However, our selection includes package quantities that range from 1 to 12 filters, so no matter what your situation may be, we've got you covered.

**Q: How do I change my air filter?**
A: After finding the right size, turn off the power supply and remove the cover from your intake vent before taking out the old filter. Then just insert your new filter to match the direction of air flow, replace the cover, and turn the power back on.

## Frequently Bought Together

- Filterbuy 21x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 20.50 x 21.50 x 0.75 Inches)
- Filterbuy 12x24x2 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 11.38 x 23.38 x 1.75 Inches)
- Filterbuy 10x10x2 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 9.50 x 9.50 x 1.75 Inches)

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**Shop now:** [https://www.desertcart.sc/products/561638348-filterbuy-21x22x1-air-filter-merv-13-optimal-defense-4-pack](https://www.desertcart.sc/products/561638348-filterbuy-21x22x1-air-filter-merv-13-optimal-defense-4-pack)

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-02-16*