A practical, site-ready guide to DIN WC/Privacy (bathroom) locks: sizes, compliance traps, fitting notes, and a printable fitter’s template + inspection card.

The sash lock is the workhorse of mortice DIN locks — reliable, versatile, and almost always the first choice when both latching and locking are required. For fire doors, it’s a proven solution when used with certified keepers, intumescent protection, and correct installation.

A mortice lock is fitted inside the door leaf, in a pocket (“mortise/mortice”) cut into the edge of the door. It’s the opposite of a rim lock, which is surface-mounted on the face. Mortice construction gives better security, a cleaner look, and compatibility with modern Euro cylinders and lever furniture.

Drop-down seals (also known as drop seals or automatic threshold seals) are concealed within the bottom edge of a fire door.

The type of timber you choose for a frame directly affects how long it will resist fire and heat.

A fire door without a properly functioning closer is not a fire door. If it won’t shut fully, automatically, and reliably, it can’t contain fire or smoke. Yet closers are one of the most neglected components in the field — often incorrectly set, broken, or even removed.

When exposed to heat, intumescent seals expand rapidly — filling the gap between the door and frame. This slows down the spread of smoke, flame, and hot gases, buying critical escape time and protecting the structure.

Bad fire door hinges are everywhere. Inspecting them properly takes minutes and can prevent major compliance issues.

Proper signage isn’t just box-ticking — it’s part of the fire door system. Failing to install or maintain signage creates confusion, leads to misuse, and can result in failed inspections. So make it visible, make it compliant, and make sure the message is clear: This door saves lives. Treat it accordingly.