Series LD linear bar grilles are designed for supply and return air distribution in heating, cooling and ventilating applications which call for diffusers having long or con­tinuous slender appearance, fixed air discharge angles of zero or 15 degrees, and installed in walls, floors, sills or ceilings.

Construction is of extruded aluminium face, bars and frame of alloy 6063-T5, with notched mullions in alloy 6261-T5, mechanically compressed together to form a powerfully bonded core, which is welded at mullion ends to the frame.

Standard fixed blade diffusers (LD) are available along with diffusers with front fixed blades and rear adjustable deflection blades(LDSD). In addition the Plaster Mounting Frame (PMF) system is a innovative framing system that allows quick and accurate installation into a sidewall for any LD series bar grille.