Ships free. Built in the USA. As low as $7.55 per filter.
For most homes, replace every 60-90 days. If you have pets, allergies, or live in a high-dust area, replace every 30-60 days for optimal performance.
This 20X20X4.375 MERV 13 filter is compatible with the vast majority of residential and commercial HVAC systems, furnaces, and air handlers that use the 20X20X4.375 nominal size.
Fast free shipping on every order. Orders ship within 24 hours.
Ships free. Built in the USA. As low as $7.55 per filter.
For most homes, replace every 60-90 days. If you have pets, allergies, or live in a high-dust area, replace every 30-60 days for optimal performance.
This 20X20X4.375 MERV 13 filter is compatible with the vast majority of residential and commercial HVAC systems, furnaces, and air handlers that use the 20X20X4.375 nominal size.
Fast free shipping on every order. Orders ship within 24 hours.
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We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at orders@walkindustrial.com. Please note that returns will need to be sent to the following address: [INSERT RETURN ADDRESS]
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at orders@walkindustrial.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants), custom products (such as special orders or personalized items), and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at orders@walkindustrial.com.
Captures up to 98% of airborne particles, including fine dust, pollen, pet dander, mold spores, smoke, and smog. Provides hospital-grade filtration suitable for homes, offices, and medical environments. Effective against bacteria, viruses, and other microscopic contaminants. Helps reduce allergy and asthma triggers for optimal indoor air quality. Built to last up to 90 days under normal conditions (replace more often in high-demand environments).
Built with high-efficiency pleated material that outperforms fiberglass filters. Durable frame construction prevents warping and maintains a tight seal. Designed to withstand up to 90 days of use under normal conditions. Resists moisture and damage, ensuring consistent filtration performance. Proudly made to deliver reliable air quality and long-lasting value.
Traps harmful particles such as dust, pollen, mold spores, and pet dander. Reduces exposure to allergens and irritants, supporting healthier breathing. Helps create a cleaner indoor environment for children, pets, and allergy sufferers. Improves overall air quality, reducing the risk of respiratory discomfort. Supports a healthier home or workplace by keeping the air you breathe fresh and safe.
Installing your air filter is quick and easy. Just follow these steps:
 MERV 8
|
 MERV 11
|
 MERV 13
|
|
|---|---|---|---|
| BEST FOR | STANDARD Residential/Commercial Healthy Families |
SUPERIOR Residential/Commercial Allergy Sufferers |
OPTIMAL Residential/Commercial Hospital Grade |
| COMPARIBLE RATINGS | MPR 600 & FPR 5 | MPR 1000-1200 & FPR 7 | MPR 1500-1900 & FPR 10 |
| FILTRATION | Captures 90% of Airborne Particles |
Captures 95% of Airborne Particles |
Captures 98% of Airborne Particles |
| Dust, Lint & Debris | ✓ | ✓ | ✓ |
| MOLD, POLLEN | ✓ | ✓ | ✓ |
| DANDER, DUST MITES | ✓ | ✓ | ✓ |
| SMOKE & SMOG | ✓ | ✓ | |
| BACTERIA | ✓ | ||
| ODOR, VOCS |
