The Doran A-1212 can be used as a ceiling fan, or be used to exhaust outside the darkroom with the use of an outdoor wall cap. The fan is light tight, and comes with a molded-in 6-inch diameter pipe starter so the exhaust air can be piped to a wall cap or roof jack if desired. The A-1212 fan is rated at 400CFM, requires a 12"x 12" hole size, and is intended for rooms up to 12ft. x 12ft. in size. 120V 60Hz operation. 13¾"x 13¾"x 6¾" exterior dimensions.