This is a standard unmarked mystery filter. I bought what was advertised as a 16X25X4 MERV 12 air filter. A long time ago the electronics in my Honeywell ESP system died. I've been using media filters ever since. I wanted maximum filtering and this seemed like a good choice. The filter I received was 3 3/4 thick. The Honeywell filter I removed was 4 5/8 inches thick. There was almost a full inch of wiggle room. The wiggle room allows unfiltered air to take the path of least resistance, bypassing the filter entirely. The only markings on this versatile filter were the size and direction of airflow. MERV was not printed on the filter. As far as I know, my MERV is 0.
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 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 3/8" NPT Compressed Air Filter Regulator Combo Piggyback, 5 Micron Brass Element, Poly Bowl, Semi-Auto Drain, Metal Bracket, 0-150 Psi Gauge
26 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