What a shopfront shutter is actually protecting against

A shopfront shutter is attacked in three predictable ways. The parts that resist each of them are small, cheap, and usually left off the quotation.

A shopfront shutter is attacked in three ways, and each has a part that answers it.

Levering at the bottom rail is the common one, and the answer is the automatic latch: it throws as the curtain lands, draws no power, and holds through a cut or a flood. Code capture is the second, and the answer is a rolling-code handset that retires each code as it uses it. Forcing the curtain itself is the third, and the answer is slat gauge and the end-cap detail rather than anything electronic.

The parts that do this work are small and rarely itemised: the latch, the self-stopping contact strip inside the bottom rail, the felt and rubber seals in the guides. The contact strip is worth naming because it is the one that stops the door on anything in its path — a person, a vehicle, a pallet — and it is inside the rail where nobody sees it.

Retail stock peaks before a holiday and staff attention is elsewhere; that is when the door is tested. It is worth checking the latch throws and the sensing stops the curtain before the season rather than during it.