Looking for a 20x20x4 square filter for your TopTech system? We have all three options in stock - genuine TopTech OEM, QuikBox version, and our top-rated Atomic compatible filter that saves you 40% without sacrificing quality.
✓ Your 20x20x4 TopTech Filter Options:
| Filter Type |
Model # |
Price / per filter |
Best For |
| TopTech OEM Standard |
TT-FM-2020 |
$47.99 |
OEM replacement |
| TopTech QuikBox® |
TT-FM-2020QB |
$43.99 |
Quick changes |
| Atomic Compatible |
AF-2020M11 |
$28.99 |
Smart shoppers |
Why Choose 20x20x4 Square Filters?
Square 20x20x4 filters (actual size: 19.375" x 19.375" x 3.75") are perfect for balanced airflow in cube-style cabinets. This size is particularly popular in:
- • 3-4 ton residential HVAC systems
- • Light commercial applications
- • Retrofit installations where space is limited
- • TopTech TT-MAC-2022 and similar cabinets
Technical Specifications (All Options):
- ✓ Filtration: MERV 11 - removes 85% of particles 3-10 microns
- ✓ Actual Dimensions: 19.5" x 19.5" x 3.75"
- ✓ Frame: Moisture-resistant beverage board
- ✓ Media: Pleated synthetic (no fiberglass)
- ✓ Temperature Rating: Up to 200°F continuous
💡 Pro Tip: The square design of 20x20x4 filters means you can't install them backwards - they fit perfectly either way! This makes the QuikBox version especially convenient for DIY filter changes.
Bulk Pricing Available
Order a Atomic case of 3 filters and save. Subscribe for automatic delivery and save plus free shipping!
