Where shown on plans, provide custom fabricated Anemostat model THD-1500 heavy-duty, extruded aluminum suspension systems that provides lay-in installation of the laminar flow air outlets, recessed fluorescent lights and trim plates for accessory equipment. Closed cell gaskets shall be provided on the THD-1500 grid members to prevent air leaks around equipment installed on the grid system and the transfer of air between the ceiling plenum and occupied space. Gaskets may be omitted from the grid where the equipment being installed includes gaskets. The modular grid shall be fabricated of extruded aluminum inverted tee members with a minimum thickness of 1/8”, a minimum height of 1-3/4”, and exposed face of 1-1/2”. All exposed edges shall be radiused .015”. The modular tee section frames shall be notched, mitered, and heliarc welded at the intersections of T / L member mating joints. Where total installed grid system size exceeds 5’ x 10’, the system shall be fabricated and shipped in sub-sections. The mating members of sub-sections shall be fabricated of half tee or “L” members butted together and shall have dimensions identical to the basic full tee member. The “L” extrusion members shall be of an interlocking design such that mating L members, when fastened together, assure a hair-line seam between abutted sections and a leak-proof seal. No gasketing or sealant shall be required between mating L sections for a leak-proof joint. The butting “L” extrusions shall use clips to hold mating L sections together during hoisting and installation. The tee and “L” extrusion members shall be pre-punched on 12” centers for galvanized hanger wire supports. The number of hanger wires shall be equal to and spaced to match the number of grid corners or intersections and provide support for all members formed with the split tee or “L” members. Hanger wire shall be adequate to support a load of 10 lbs. / Ft2 of ceiling surface. A full tee member shall be installed at the perimeter of the grid assembly to transition to the perimeter plaster ceiling. Where the grid system or portion of the grid system is directly adjacent to the wall/ceiling line, provide “L” members for direct attachment to the wall. The perimeter outside or inside corners as installed, shall consist of mitered joints. The THD-1500 suspension system shall be manufactured by the laminar flow air outlet manufacturer, and shall be installed under Section _________________ .  The grid system manufacturer shall forward plan details showing orientation of grid or grid sub-sections to the installing contractor.

The grid system finish shall be:
Option 1:  Arctic White epoxy finish
Option 2:  Mill Finish
Option 3:  Natural Anodize