The Dometic Dust Reduction System (DRS) is a rooftop ventilation unit which minimises the amount of dust, pollen and other airborne particles entering your Caravan. This non-powered unit works while you are driving by allowing filtered, clean air to enter and pressurise the vehicle which reduces additional dust from entering the RV. With a sleek modern design the DRS can be fitted into a range of rooftop openings - from 290 x 290mm to 400 x 400mm. Reduces amount of dust entering the caravan Filters out dust and other airborne particles with a replaceable PM10 filter Provides 150cm2 ventilation when stationary Clever design stops rain entering the vehicle Non-powered Low profile, lightweight design 1 year warranty. Dometic DSR2 Suits Cut Outs: 290 x 290mm to 400 x 400mm Suits Roof Thickness: 30mm - 65mm Weight: 5kg Ventilation Opening: 150cm2 Overall Dimensions(mm): 444(w) x 245(h) x 473(d)