Cimatec Aircleen 1500 Series 16" x 25" x 1" MERV 12 Electronic Air Cleaner Filter System (# 1500-1625) Moisture resistant electronics draw only 2 watts of power; durable frame design; 5-year warranty Operates on 24 Volts AC at 2VA; may require 120V to 24VAC transformer if not available on furnace E.P.T. (electronic polarization technology) turns media pads into giant magnets Recommended media change: Every 3 months; Pop-up corners for easy, user-friendly maintenance For future replacement media, order part # 1500MK-1625 (4 filter changes, good for one year!)