When using the 1:4 Heavy Duty chain drive with child safety breakaway the continuous chain must be the correct length so that the bottom of the chain is no lower than 60cm above the floor.
State the exact chain length required in the box provided.
To calculate maximum allowable chain length to comply with child safety regulations:
Max drop of chain = (Height of headrail from floor in cm - 60cm)
Length of chain = drop x 2