The enclosure assembly includes an enclosure body which is adapted to accommodate a laser scanner therein for use in a sawmill environment. The enclosure body includes a lid portion which is hinged to permit access to the interior of the enclosure for convenient removal and cleaning of the laser scanner. A front end assembly extends from a forward end of the enclosure body and includes an air knife member mounted therein which in operation produces an air curtain which extends from the air knife towards the workpiece, tending to maintain the debris away from the laser.