Built-in Lennox filter. In December 2019 I had to upgrade to a new Lennox HVAC system. I thought I would replace the installed MERV 16 filter with the new system as it is almost 6 months old. But I was surprised that very little dirt got into the original filter, so I reinstalled the old one and will wait for the filter to get dirtier. I have cats and the carbon fiber in the filter helps get rid of cat litter odors throughout the house.
NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
20 Review
NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 Review
NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
23 Review
NANPU 1 FRL Air Filter Regulator Lubricator Combo With 0-150 Psi Gauge, 5 Micron Brass Element, Poly Bowl & Semi-Auto Drain - Metal Bracket Included
20 Review