Mesker Hollow Metal Steel Stiffened Doors
Our unique design of the Mesker temperature rise door has earned it a best-in-class rating for heat transmission,
as tested by Underwriters Laboratory in accordance with ASTM E152. Using premium fiberboard core, our
temperature rise door keeps the side of the door not exposed to fire below 250 degrees F for 30 minutes. Our
competitors' temperature rise doors may reach 400 degrees F - enough to remove human skin when touched. Do
your research. Talk with fire authorities. You'll find agreement that temperature rise doors which transfer less
heat, less quickly are safer.
This graph charts how long it takes the temperature of the unexposed door face to increase. Temperature rise
doors can be fire-rated 20 minute to 3 hour.

Click to download a Tech Data Sheet:

Basic Fire Door Requirements