Furnish Rolling Grilles, series 350 as manufactured by “ADT” complete with curtain, hood, guides, counterbalance and options as specified.

Curtain construction shall be ADT 9” straight pattern with all exposed metal to be galvanized, aluminum, or stainless steel. Continuous horizontal rods 2 1/4” o.c. are to be covered with tubular spacers. Spacer to be stainless steel, or aluminum. Links to be of stainless steel or aluminum. Rods to be bright basic or galvanized wire. End links to be furnished to pevent grille from exiting guides. Bottom of grill shall be provied with a tubular aluminum bottom bar. Bottom bar to house locking mechanisms.

Grille Pattern

Bottom bar to be heavy duty 2″ x 3″ extruded aluminum tubular bottom bar. Designed to minimize deflection for large openings. Upper section interlocks to vertical links. Lower section will accept (optional) internally installed cylinder locks.

Locking for manual and crank operated grilles to be cylinder locks mounted inside the bottom bar. Gearing within motors to be self locking. Motorized grilles with locks require track mounted interlocks or a H operator with a lock sensor.

Spring counterbalance is to be housed in a steel pipe of the appropriate diameter and wall thickness as to support curtain. Deflection shall be limited to a maximum of .03″ per ft. of door width. Springs are to consist of helical torsion types designed to meet a 25% load factor. Safety factor allows for safe operation, ease of use, and longer spring life. Springs are to be grease packed and anchored, using a cast iron anchor, to a cold rolled steel inner shaft. Spring tension shall be fully adjustable from outside of end bracket plate. To insure smooth operation end bracket plates shall contain sealed ball bearings to minimize wear of pipe shaft.

End bracket plates shall consist of steel plate no less than 3/16″ thick. Bracket plates are to house pipe shaft and counterbalance assembly. Shaft is attached to plate by sealed ball bearings fitted onto plate.

Guides shall consist of extruded aluminum. The guide depth shall be of a length adequate to provide for proper curtain penetration. Brush pile inserts at the throat of the guides to reduce noise and act as a wearing surface. Locking channels at the guide edge prevent grille from being forced out of the guide.

Hoods shall consist of a minimum of #24 gauge hot dipped galvanized steel with a baked on grey or bronze polyester enamel coating. Hoods are designed to protect and house counterbalance assembly. To prevent hood sag intermediate supports shall be furnished as required.

Finish all non-galvanized surfaces shall receive a shop coat of rust inhibiting primer. Aluminum to have natural mill, or optional clear anodized, or bronze anodized finish. Stainless steel to have #2b or #4 finish. Field painting not included in this section.

Installation to be by ADT or by an authorized dealer.

Options Consult factory.