Premium Universal Replacement True HEPA Filter HRF-D1 (formerly HRF-11) can be stacked to replace discontinued HEPA Filters 20500, 20590.
- Genuine Honeywell Enviracaire True HEPA filter
- 99.97% effective at removing particles as small as 0.3 microns from the air that passes through the filter
- Honeywell Air Filter "D"
- Filter Dimensions: Approximately 11" OD x 6" ID x 2-7/8" H
- Gasket Dimensions: Approximately 11" OD x 1" H
- Weight: 1.3 lbs
1 HEPA Filter and 1 Foam Gasket
Refer to the table below to determine how many HRF-D1 filters you'll need to stack:
When to Replace the HEPA Filter:
The HEPA Filter should remain effective for 3 to 5 years, depending upon the environment in which the air purifier is operating. The manufacturer recommends changing the HEPA filter based upon operating conditions - every 3-5 years for light usage, 2-3 years for normal usage, and 1 year for heavy usage.
Note: The HRF-D1 is identical to the recently discontinued HRF-11 which advertised a permanent HEPA filter. Aside from the model number, the only other thing that has changed is the product packaging, which no longer advertises the filter as being permanent. Again, only the advertisement has changed - the product remains the same.