Every fire door should have an appropriate "Fire door" sign fitted. Where doors can be used from either side a sign is required on both sides. Doors which open on to a fire escape corridor should be locked shut and signed accordingly.Material Options ExplainedChoose the right material for your application:.Rigid Plastic: Lightweight, gloss white PVC with high impact strength. Suitable for both internal and external safety signs. Easily drilled for wall fixing.Self-Adhesive Vinyl: A high gloss, flexible PVC vinyl with self-adhesive backing. Suitable for applying to most smooth, dry and clean surfaces. Ideally suited for internal signs.