The Lennox Healthy Climate x0585 HCF14-10 filter is an OEM replacement for Lennox HCC14-23, but will fit a range of other units that accept 20" x 20" x 5" box media filters. This filter is designed to work with your HVAc system to filter out particles down to 3 microns in size without adding to the cost of your regular energy bill. This filter is perfect for homes with average filtration needs. You'll notice a significant improvement with this filter when switching from a standard fiberglass filter from your local store. Remove dust, dirt, mold spores and more without emitting any additional ozone, which can add to common lung irritation and exacerbate asthma. When replacing your filter, point the arrow toward the unit. Shut off your unit to prevent any fan interference. Write the replacement date on your filter. Replace filters every six months. **NOTICE** Lennox is converting their MERV 10 filters to MERV 11. The same part #'s will be used.