These security grilles are a Furnish Rolling Grilles, series 375-ERG as manufactured by “USP” complete with curtain, hood, guides, counterbalance and options as specified. The Grille Systems are available in sizes from 6 feet wide to 24 feet wide and 7 feet high to 14 feet high.



Details About These Roller Shutter Doors

The FGH Motor Operator is provided to allow daily use operation, auto- emergency opening is achieved by receiving signals from fire alarm, emergency open push button or loss of power. This signal releases power to motor which disengages governor brake to allow the security grille to open thru motor drive assembly, system is reset once power is restored.

The curtain construction is a rolling door that shall be USP straight patterned with all exposed metal to be aluminum. The continuous 5/16 horizontal rods are spaced 2 inches o.c. or optional 1-½ inch or 1 inch spacing. The links form vertical chains of eyeletted aluminum ¾ inch wide. The chains are positioned using E-rings on 9 inch (6 inch) (3 inch) centers. The double E-rings are to be furnished at the ends to prevent the grille from exiting guides. The bottom of the grille shall be provided with a tubular aluminum bottom bar. The bottom bar is to house locking mechanisms.




The bottom bar is a heavy duty 2 inches x 3 inches extruded aluminum tubular bottom bar. It is designed to minimize deflection for large openings. The upper section interlocks to vertical links. The lower section will accept (optional) internally installed cylinder locks.

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

model375_image2aThe spring counterbalance is to be housed in a steel pipe of the appropriate diameter and wall thickness as to support the curtain. The deflection shall be limited to a maximum of .03 inch per foot of door width. The springs are to consist of helical torsion types designed to meet a 25 percent load factor. The safety factor allows for safe operation, ease of use, and a longer spring life. The springs are to be grease packed and anchored, using a cast iron anchor with a cold rolled steel inner shaft. The spring tension shall be fully adjustable from outside of the end bracket plate. To ensure smooth operation, the end bracket plates shall contain sealed ball bearings to minimize the wear of the pipe shaft.

The end bracket plates shall consist of steel plate no less than 3/16 inch thick. Bracket plates are to house pipe shafts and the counterbalance assembly. The shaft is attached to a plate by sealed ball bearings fitted onto plate.


The guides shall consist of extruded aluminum. The guide depth shall be of a length adequate to provide for proper curtain penetration. The 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 the grille from being forced out of the guide.

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

The finish for all non-galvanized surfaces shall receive a shop coat of rust inhibiting primer. The aluminum will have a natural mill, or optional clear anodized, or bronze anodized finish. The stainless steel will have number 2b or number 4 finish. The field painting is not included in this section.

Installation to be by USP or by an authorized dealer.

For options consult the factory.

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