Set the duration and speed with the remote control from as far away as 45 feet, then hold on as the fan spools up to draw a massive 1400 CFM through the 5 micron primary filter and then through the 1 micron secondary filter. Changes the air in a 20' x 20' x 8' room 26 times an hour. Hangs easily from the ceiling. Three pocket internal filter bag simplifies cleaning. Dimensions 30-1/8" x 19-7/8" x 16-3/8", weighs 73 lbs. CSA certified versions may be available upon request.