Whenever there is an obstruction the garage door will automatically reverse before causing any damage.
Garage door clearance sensor.
Most standard garage doors with extension springs require a minimum of 10 inches of headroom.
F change in floor level at doors.
Where a door opens over a landing the landing shall be at least as wide as the door and at least 5 feet long.
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Regardless of the occupant load there shall be a floor or landing on each side of a door.
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The reason for the additional clearance for torsion spring doors is due to the brackets that hold each end of the torsion bar.
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In this video i show you how to realign your garage door sensors so that the garage door can function properly.
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I an external photoelectric sensor that when activated results in an operator that is closing a door to reverse direction of the door returns the door to and stops the door at the fully open position and the sensor prevents an operator from closing an open door.
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Doors that use torsion springs require at least 12 inches of headroom.