Lennox Healthy Climate HCC14-23 Healthy Climate True Fit HC16 filter cabinet - X7930. Filter dimensions: 20" x 20" x 5".

The Lennox Healthy climate HCC14-23 Healthy Climate True Fit HC 16 filter cabinet does NOT come with a filter, you will need to order that separately. Here are the recommended filters for the Lennox Healthy Climate HCC14-23 Healthy Climate True Fit HC16 filter cabinet:

Lennox MERV 16 filter media as well as some MERV 11 filter options as well. 
The Lennox X7935 MERV 16 filter is a suitable replacement for this Lennox HCC14-23 cabinet, as is the Lennox X0585 MERV 11 filter.
There are also "expandable" pop-up filter kits available such as the Lennox X8308 MERV 16 filter and the Lennox X8305 MERV 11 filter.

Click Here for the Installation Instructions and Homeonwer Guide for the Healthy Climate Cabinets