Lennox 19L17-20" x 25" x 5" Healthy Climate HCF20-13 Air Filter, MERV 13 (2-Pack)

The Lennox Healthy Climate HCF20-13 air filters come in a pack of two and feature a MERV 13 rating, making them effective in filtering fine particles in the air. It is important to note that effectiveness also depends on the MERV rating selected. These filters have actual dimensions of 19 3/4" x 24 3/4" x 4 3/8", which is slightly smaller than the advertised size. However, this is typical for most air filters. Frequency of replacement largely depends on the amount of dust and debris in the air, but a general rule of thumb is every 4-6 months. Overall, customers seem to be satisfied with the Lennox Healthy Climate air filters, with many praising their effectiveness in filtering fine particles in the air. Some customers did note issues with the size of the filter and the occasional shipping damage, but these seem to be isolated incidents.