We moved into a house with an old Honeywell electrostatic air filter from the 1980's. It might have worked once, but it definitely didn't work anymore. There was a thin filter in the shaft in front of him, but it wasn't very effective. The smart guys at 3M designed this paper filter to fit perfectly in the ESP chamber. Ours lasts about a year just for heating. Retrofitting technology has rarely worked so easily and so well.
NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
20 Review
Filter under the sink Aquaphor Favorit ECO silver
20 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
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