Fire Rated Door 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 rated door threshold.

When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible. 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. With a ribbed top it offers more slip resistance than smooth top thresholds. Fire rated ul10b negative pressure.

Metal fire doors can attain ratings up to 3 hours where wood fire doors can be rated up to 90 minutes. It is ideal for an exterior door and is compatible with both in swing or out swing doors. Commercial fire rated door requirements are typically determined by the fire rating of the wall and use of the door. Use it to make a transition between flooring surfaces as well as to reduce the gap between a door and the floor.

Fire rated ul10c positive pressure. A mill finish aluminum aluminum. This threshold has a seal to provide protection from the elements. Add pemkote option to add a thermally infused anti skid coating to the threshold.

The threshold height can be adjusted to ensure a tight fit under a door. This zero 70 high quality fire rated interlocking threshold prevents air wind and water infiltration.