MA836 Doors Kept Closed When Not in UseThe MA836 Doors Kept Closed When Not in Use is part of our Mandatory Sign Range. Our Doors Kept Closed When Not in Use is suitable for various Offices, Factories, Commercial Buildings. The MA836 clearly identifies the Fire Door throughout Offices, Factories, Commercial Buildings. The format of the standard MA836 sign is Square and displays a White Doors Kept Closed When Not in Use text on a Blue Background.