Ask the Experts | Ask the Door Guys | Largest Size Visible Glazing in Fire Rated Doors

Question:

What is the largest size visible glazing that can be put into a fire rated door?

 

Answer:

The required hourly rating will dictate the approved glazing lights available. All glazing used in fire doors must be listed and labeled.

Basic guidelines on glass are as follows:

  • 20 Minute: 1,296 sq. inches per light with neither dimension exceeding 54”
  • 45 Minute: 1,296 sq. inches per light with neither dimension exceeding 54”
  • 1-1/2 Hour: 100 sq. inches per door leaf max
  • 3 Hour: Flush door, No glass

 

Do you have a question, or need a quote? Contact your local IDN Branch, or ask the Door Guy through our website.

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