---
product_id: 16172655
title: "Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75)"
brand: "filterbuy"
price: "968 Lei"
currency: RON
in_stock: true
reviews_count: 8
category: "Filterbuy"
url: https://www.desertcart.ro/products/16172655-filterbuy-21x22x1-air-filter-merv-13-optimal-smoke-and-allergy
store_origin: RO
region: Romania
---

# Made in USA with recyclable materials 16 pleats/ft for 3x longer filter life MERV 13 captures 98% dust & allergens Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75)

**Brand:** filterbuy
**Price:** 968 Lei
**Availability:** ✅ In Stock

## Summary

> 🌀 Breathe smarter, live better — upgrade your air game now!

## Quick Answers

- **What is this?** Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75) by filterbuy
- **How much does it cost?** 968 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/16172655-filterbuy-21x22x1-air-filter-merv-13-optimal-smoke-and-allergy)

## Best For

- filterbuy enthusiasts

## Why This Product

- Trusted filterbuy brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Electrostatic pleated media traps more particles and lasts 3x longer than standard filters.
- • **Proudly American:** Crafted 100% in the USA from industrial-grade recyclable materials for trusted indoor air quality.
- • **Elite Air Defense:** MERV 13 rating blocks germs, smoke & allergens with hospital-grade efficiency.
- • **Seamless Fit & Flow:** Precision 20.5"x21.5"x0.75" size ensures universal compatibility without airflow restriction.
- • **Durability Meets Design:** Dual wire-backed beverage board frame resists heat and warping for reliable performance.

## Overview

Filterbuy’s 21x22x1 MERV 13 air filters deliver superior smoke and allergy defense with 98% dust capture efficiency. Featuring electrostatically charged pleated media with 16 pleats per foot, these filters last 3x longer than fiberglass alternatives. Designed with durable dual wire-backed frames and precision sizing, they fit most HVAC systems seamlessly. Made entirely in the USA from recyclable materials, they ensure dependable, high-performance indoor air quality for health-conscious professionals.

## Description

Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75) - Replacement Furnace Filters - desertcart.com

Review: Merv 13 - These filters are the best made filters I have found to date. Sharp folds, tight construction. They filter so well that I had to tape them, otherwise they are vacuumed by my Carrier system. Unfortunately, filter housings are very poorly designed in most AC systems. By blue taping the filters you prevent any filtering loss that will happen with most systems. Air quality has improved by a huge massive lot vs Merv 8 that I was using. These Merv 13 even help with fumes and cooking smells. I have some serious allergies and these filters are definitely a game changer for those who spend more time at home. I feel soo much better. Extremely happy with the change and the filtration capabilities. I have noticed no change in my carrier system performance whatsoever. I'm sure it is harder for the blower motor to use merv 13 filters, but my AC handles it perfectly. Merv 13 could be too much for some older AC systems, so always consider check your model and capabilities of it. My AC is purposely undersized. I run my AC for about 10 to 15 hours a day during the long Central FL summers. You can see how the new vs old looks in the picture after a hard month of use. If you can, get these, you will love them.
Review: Good product. - Does a good job of cleaning the air. Good quality, fit properly. Lasts very well.

## Features

- UNIVERSAL COMPATIBILITY: 21x22x1 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 21.50" x 0.75")
- MERV 13 PERFORMANCE: Protect your home or business from germs, bacteria, and more with MERV 13 synthetic media (comparable with MPR 1900 & FPR 10) that captures 98% of dust without restricting air flow
- LASTING FILTRATION: Electrostatically charged media with 16 pleats per foot traps more microscopic particles and lasts 3x longer than fiberglass models (replace every 90 days for best results)
- SUPERIOR CONSTRUCTION: Easy installation beverage board frames with dual wire backing outperform basic cardboard designs by improving durability 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 you can trust

## 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 Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75) - Image 1](https://m.media-amazon.com/images/I/712I3uQKgHL.jpg)
![Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75) - Image 2](https://m.media-amazon.com/images/I/718ymo8TTEL.jpg)
![Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75) - Image 3](https://m.media-amazon.com/images/I/816PAX-1tyL.jpg)
![Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75) - Image 4](https://m.media-amazon.com/images/I/81GecgBthNL.jpg)
![Filterbuy 21x22x1 Air Filter MERV 13 Optimal Smoke & Allergy Defense (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 20.50 x 21.50 x 0.75) - Image 5](https://m.media-amazon.com/images/I/81O3v4mEvsL.jpg)

## Available Options

This product comes in different **Style** options.

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Merv 13
*by S***A on July 12, 2025*

These filters are the best made filters I have found to date. Sharp folds, tight construction. They filter so well that I had to tape them, otherwise they are vacuumed by my Carrier system. Unfortunately, filter housings are very poorly designed in most AC systems. By blue taping the filters you prevent any filtering loss that will happen with most systems. Air quality has improved by a huge massive lot vs Merv 8 that I was using. These Merv 13 even help with fumes and cooking smells. I have some serious allergies and these filters are definitely a game changer for those who spend more time at home. I feel soo much better. Extremely happy with the change and the filtration capabilities. I have noticed no change in my carrier system performance whatsoever. I'm sure it is harder for the blower motor to use merv 13 filters, but my AC handles it perfectly. Merv 13 could be too much for some older AC systems, so always consider check your model and capabilities of it. My AC is purposely undersized. I run my AC for about 10 to 15 hours a day during the long Central FL summers. You can see how the new vs old looks in the picture after a hard month of use. If you can, get these, you will love them.

### ⭐⭐⭐⭐⭐ Good product.
*by F***4 on December 31, 2025*

Does a good job of cleaning the air. Good quality, fit properly. Lasts very well.

### ⭐⭐⭐⭐⭐ Filterbuy Merv 13
*by L***. on December 5, 2025*

The 4" Filterbuy has a 4" slim fit option. Filters are good quality and arrived promptly.

## 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)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ro/products/16172655-filterbuy-21x22x1-air-filter-merv-13-optimal-smoke-and-allergy](https://www.desertcart.ro/products/16172655-filterbuy-21x22x1-air-filter-merv-13-optimal-smoke-and-allergy)

---

*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-24*