If your steel fire door has a gap larger than 1/8 inch, (+/- 1/16th), it is not code compliant. For both top and vertical gaps up to 1/2 inch, use the Crown Fire Door Stop System.
For fire door gaps up to 1/2 inch on the latch side, use the Fire Door Stop Vertical System. For true smoke seal, use the Crown Fire Door Stop System. If latch engagement is an issue, add the Crown Latch Protector.
Excessive clearances of up to 1", at the center of paired steel doors, can be eliminated using our Vertical Extension. Choose the product that matches your door and hardware type.