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Garage Door Technician
Garage Door Maintenance & Service Certification
Commercial & Jackshaft Service
Knowledge Check
Commercial & Jackshaft Service
Knowledge Check
Knowledge Check
1 / 11
Why must commercial chain hoist locks be tested at every maintenance visit?
A
Testing chain locks is only required in earthquake zones
B
Locks are tested only for insurance documentation purposes
C
Chain locks only need testing when new operators are installed
D
To verify the lock can secure the door in the open position to prevent unexpected closing and entrapment during loading dock operations
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