Metal CAMS in P/U panels at least 3 per panel
Self-closing door size 800x1800mm.
Heated wire around door frame.
Heavy duty hinges (preferably spring loaded).
Magnetic door gaskets.
Heavy duty door handle that allows for a padlock.
Safety push release inside.
Exterior temperature gauge.
Heated Pressure release vent.
Vapor proof interior light with exterior pilot light switch.
Clear PVC strip curtains to reduce loss of cold air