This security grille is a Furnish Insulated Rolling Service Doors, series 400 as manufactured by “USP” complete with curtain, hood, guides, counterbalance and options as specified.


  • chain hoist using gear reduction and hand chain
  • external industrial motors

Details About This Rolling Door

The curtain on this roller door consists of interlocking IS3 thermal slats, cold rolled formed from galvanized steel baked on model400_imagegray polyester enamel coating, or 304 stainless steel with a number four finish. Each end of alternate slats are to be assembled with polycast nylon end locks to maintain slat alignment and to act as a wearing surface inside the door guides and reduce noise from metal to metal contact. The slats are designed to withstand windloads of 20 psf. The windlocks are furnished for greater windloads and upon request(consult factory). Slat thickness shall be calculated with U.S. gauging with a minimum of 20ga. for doors up to 30 feet wide and 18ga. for wider spans. The interlocking 24 gauge protective back slat encloses the insulating core reducing heat and sound transmission. The steel slats are to be galvanized as per A.S.T.M. A653. Each curtain shall receive a bottom bar to maintain slat alignment and posture.

The insulation shall consist of closed cell urethane foam injected insulation a minimum of 1 inch thick, providing a 7.2 R-value and sound barrier protection with an STC 25 rating. Insulation is pressure foamed in place bonding both the front and back slats while filling all voids and creating a thermal break.

The bottom bar shall consist of two steel factory painted angles a minimum ⅛ inch thick. The rolling door includes rubber astragal to form a weathertight seal, on a level surface, upon closing the roller service door.

model400_image1The spring counterbalance is to be housed in a steel pipe of the appropriate diameter and wall thickness as to support 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 type designed to meet a 25 percent safety load factor. The safety factor allows for safe operation, ease of use, and longer spring life. The springs on this roller door are to be grease packed and anchored, using a cast iron anchor, to a cold rolled steel inner shaft. The spring tension shall be fully adjustable from outside of end bracket plate. To ensure smooth operation end bracket plates, they shall contain sealed ball bearings to minimize the wear of pipe shaft.

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

The guides shall consist of a minimum of three inches of structural steel angles and a minimum of 3/16 inch thickness. The guide depth shall be of a length adequate to provide for proper slat penetration and specified windloading. When windlocks are provided a windlock bar shall be furnished within the guide to prevent curtains from leaving the guides under the windload.

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 shall be furnished as required.

Full weather stripping shall include:

  • Neoprene hood baffle
  • Vinyl guide seals
  • Neoprene astragal on bottom bar

Locking for manual and chain operated doors are to be slidebolts mounted on a bottom bar with provisions for padlocks. The gearing within motors are to be self-locking.

The finish for all non-galvanized surfaces shall receive a shop coat of rust inhibiting gray or bronze industrial enamel paint. The field painting is not included in this section.

Installation to be by USP or by an authorized dealer.


  • Poly-cote® polyester powder coating, 200 select colors
  • Acrylic vision lites
  • High cycle springs
  • Sloping bottom bar
  • Pass door
  • 18 gauge steel slats
  • Stainless Steel Slats
  • Aluminum Slats
  • Safety edge
  • Remote control
  • Timer to close
  • Cylinder locks
  • Electric interlocks
  • Lintel seals
  • Mallleable iron endlocks and windlocks

If you need a rolling door to secure your facility, then contact us.