Aprilaire 501 Replacement Filter
The Aprilaire 501 Replacement Filter is an OEM whole-home media cabinet filter engineered with 19.75 x 24.25 x 5 in actual dimensions to provide deep-surface particulate capture with minimal system static pressure.
3-Year True Cost of Ownership Model
Targeted for E3 coarse particles (dust, lint, large pollen) to protect equipment.
Deep pleat geometry delivers high surface area and minimal static pressure drop.
Thermal beverage board frame with wire backing to prevent media collapse under blower load.
Bulk multi-pack procurement typically reduces annual per-filter cost by 25% to 40%.
- Massive media surface area lasts 12 Months
- Ultra-low static pressure drop (0.14 in. w.g.)
- Self-sealing gasket prevents air bypass
- Official OEM fit and durability
- Requires professional 5-inch media cabinet installation
- Higher unit replacement cost than standard 1-inch filters
Verified Engineering Specifications
| Nominal Dimensions | 20x25x5 | Actual Dimensions | 19.75 x 24.25 x 5 in |
|---|---|---|---|
| Filter Depth | 5-inch | Media Construction | Collapsible Pleated Media |
| ASHRAE MERV Rating | MERV 10 | Proprietary Rating | | FPR 7 |
| Initial Resistance | 0.14 in. w.g. @ 400 FPM (Ultra-Low Resistance) | Airflow Capacity | |
| Replacement Filter Cost | $49.99 | Replacement Interval | Every 12 Months |
| Annual Consumable Cost | $49.99/yr | Compatible Equipment | Aprilaire 5000 Air Cleaners |
Our Take on the Aprilaire 501 Replacement Filter
A premium whole-house filtration cartridge that maximizes blower motor efficiency while capturing allergens down to sub-micron sizes.
Filtration Performance Note
Tested under ASHRAE 52.2 protocols, achieving MERV 10 rating with 40+ square feet of expanded pleated media.
Installation, Airflow Direction & Maintenance Protocol
Turn off furnace power. Unlatch media door, slide out exhausted cartridge, and slide new cartridge along cabinet guide rails.
Common Questions About the Aprilaire 501 Replacement Filter
How often does this media filter need replacement?
Under typical home use, this deep cartridge lasts 12 Months. Homes with pets or high dust should inspect at 6 months.
Can I use this filter in a standard 1-inch slot?
No. This 5-inch filter requires a dedicated whole-home media cabinet installed adjacent to your furnace or air handler.
Is this an authentic OEM replacement?
Yes, this matches official Aprilaire engineering specifications with factory self-sealing technology.
Compatible Cabinet Media Alternatives
Lennox Healthy Climate X6673
When to choose: Direct 20x25x5 compatible fitment offering MERV 11 performance.
Lennox Healthy Climate X6675
When to choose: Direct 20x25x5 compatible fitment with MERV 16 filtration.