Fire Door Without Threshold

When nfpa 80 requires sills to have a minimum width of 4 inches some have interpreted that to mean that fire door assemblies are required to have a 4 inch wide threshold.

Fire door without threshold.

A fire rated door must be hung on ball bearing type hinges made from steel or another non ferrous metal. And can be used with new masonry and drywall construction when the wall is being built. Bs9999 2008 recommends for fire doors with cold smoke control that the threshold gap should be either less than 3mm in height or should be fitted with a threshold seal. Doors up to 4 0 wide and 8 0 tall can use standard weight 134 thickness.

The frame is compatible with walls that have a thickness of 4 7 8 in. Door hardware must be fire listed and comply with the national fire protection association s nfpa80 standard for fire doors and fire windows hinges. When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible. Fire door assemblies are not typically required to have thresholds so defining the terminology helps to establish that the minimum 4 inch sill is actually part of the.

The growing field of access control and electronic entry systems has resulted in some fire doors being field modified without proper listing agency approval. Field modifications of fire listed assemblies must either be inspected by a listing agency representative or. The door panel and frame are both made from galvanneal steel to secure and protect your home or building.