Lennox Furnace Filters
Genuine Lennox OEM replacement furnace filters: Healthy Climate (HCF), Carbon Clean, PureAir (PCO) and BMAC/PMAC cabinet filters, MERV 7 to 16. Search by Lennox part number (like X6670) or by size. The most common are 16x25x5 and 20x25x5. Free shipping option available in Canada.
Lennox furnace filter guide: part numbers, sizes and MERV ratings ▾
How to find the right Lennox filter
The quickest way is the part number printed on the frame of your current filter or on the label inside your filter cabinet (for example X6670, X0585 or HCF16-11). If there is no part number, use the size printed on the filter. Lennox media filters are made to fit Lennox cabinets, so match the size and thickness exactly. Not sure how to read a filter size? See our furnace filter size guide.
Popular Lennox furnace filters
| Lennox part # | Also known as | Size | MERV |
|---|---|---|---|
| X6670 | Healthy Climate HCF16-11 | 16x25x5 | 11 |
| X6673 | Healthy Climate HCF20-11 | 20x25x5 | 11 |
| X0585 | Healthy Climate cabinet filter | 20x20x5 | 11 |
| 19L16 | MERV 13 replacement | 16x25x5 | 13 |
| X6672 | Carbon Clean HCF16-16 | 16x25x5 | 16 |
| X6675 | Carbon Clean HCF20-16 | 20x25x5 | 16 |
| X7935 | Healthy Climate HCF14-16 | 20x20x5 | 16 |
| X8789 | PureAir PCO16-28 | 16x26x5 | 16 |
| X0444 | PMAC-12C | 28x17x6 | 10 |
Which MERV rating do you need?
- MERV 11: the standard choice for most homes. Captures dust, pollen, pet dander and mould spores.
- MERV 13: finer filtration that also traps smaller particles like smoke. A good step up for allergies.
- MERV 16: Lennox's highest-efficiency media, including Carbon Clean filters with an activated carbon layer to help reduce odours.
If you are unsure, replace like for like with the rating your system came with. Learn more in our MERV rating guide.
Why genuine Lennox OEM?
Genuine Lennox filters are made to fit Lennox cabinets exactly, so air goes through the filter media instead of around it. That keeps your system performing as designed and your air as clean as the MERV rating promises.
How often should you change a Lennox filter?
Most 5-inch Lennox media filters last 6 to 12 months. 1-inch filters should be changed every 1 to 3 months. Change sooner if you have pets, allergies, renovations or run your system a lot. See our filter change guide.
Shop by rating: MERV 11 · MERV 13 · MERV 16. Need an unusual size? Request a custom-size filter.
