2x4 Logi-Clean Hepa Fan Filter Unit, 99.99% Efficient, 1/4 HP, Aluminum Perforated Face Screen. Unit operates at 1.4 Amps. Also available with Ulpa Filters. Qty discounts available. - Motorized Filter Modules - Non Roomside Replaceable Final Filter Our Model 421-SPX motorized hepa filter modules have undergone extensive testing to operate economically and quietly to provide hepa filtered air to most any environment. Sizes are from 2x2 to 2x4, special sizes and configurations are available. Standard features: Motor: Motorized Impeller · Voltage: 120/1/60 · 99.99% eff. at 0.3 microns and larger · Variable Speed Control · 8' power cord · Perforated aluminum face screen Optional features · Stainless steel construction · ULPA filter - 99.9995% at 0.12 microns and larger · Perforated face grille - aluminum or stainless steel · Special size to fit any grid system