2x2 Logi-Clean Hepa Fan Filter Unit, 99.99% Efficient, 1/4 HP, Aluminum Perforated Face Screen. 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 2’x 2’ to 2’x 4’, special sizes and configurations are available. Standard features · ¼ HP direct drive motor · Voltage: 120/1/60 · 99.99% eff. at 0.3 microns and larger · 3-speed motor switch · 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