Suggested Division 15 Specification Plenum Slot Diffuser High Capacity - Adjustable Model: TBD-10 - Supply Plenum slot diffusers shall be TITUS Model TBD-10 (uninsulated) of the sizes and mounting type shown on the plans and outlet schedule. Diffusers shall have 1- or 1½-inch slot widths and be available with one or two parallel slots. Standard nominal lengths shall be 2, 3, 4 or 5 feet. Units shall be constructed of 24-gauge steel. The standard finish will be black on the face of the diffuser and white on optional factory provided T-bars. Diffusers shall be available in standard low profile plenum height (8 inches) or optional high profile plenum height (11 inches). The inlet must be drawn from the plenum wall to eliminate leakage. Welded-in inlets or mechanically fastened inlets are not acceptable. The inlet must have at least 1 1/8-inch depth for duct connection. The slot face must be constructed of a double metal thickness for rigidity. Pattern controllers will be shipped loose to be installed by the mechanical contractor. Optional factory installed pattern controllers shall also be available. Optional ¼-inch thick, 2-pound density internal insulation (Model TBDI-10) shall be available. Factory furnished T-bars, plaster frames, and inlet dampers shall also be available as optional accessories. The manufacturer shall provide published performance data for the plenum slot diffuser. The diffuser shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.