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> New 4 vibratech viscous speed govenor counter fire door
New 4 vibratech viscous speed govenor counter fire door
4 New Vibratech Viscous Speed Govenor s for Roll Down Counter Fire Doors
part numbers on the parts include ITT Enidine VSG A715477
Below is some info I found on the internet
VIBRATECH Viscous Speed Governor: available on R & S Manufacturing, Inc. fire doors for new construction and retro-fit. Viscous speed governor is a patented device allowing for a smooth and quiet descent of fire doors, replaces standard ductile iron governor, and recommended on larger certificate size fire doors, either manual or motorized operation. Viscous speed governor is U.L. listed and conforms to ASTM E152, CAN4-S104, NFPA 252, and UL 10B. Simple, maintenance-free design and construction, with a one year warranty
Underwriter Laboratories tested 8M81
