Firemiser Insulated Fire Door | Fire Rated Doors | Cornell

Insulated Fire Doors

Model Number: ERD20 and ERD21


Our Firemiser Insulated Fire door combines the functionality of the rolling fire door with the benefits of an insulated service door.

In the event of a fire, the fire door functionality of this door allows it to save lives and protect property. The fire door works to compartmentalize a building to eliminate the spread of smoke flames, keeping the fire isolated.

The mineral wool used to insulate this door, helps to control sound transmission – featuring an R value of 5.3 and a U Value of .189 based on the ASHRAE Handbook of Fundamentals. The insulation also helps in a climate controlled environment by helping to maintain a different temperature on the interior and exterior of the door.  

A Firemiser insulated fire door is perfect for an application that is currently exterior, but there is a planned expansion that will require the opening to be fire rated in the future.

Our insulated rolling fire door is UL listed, Factory Mutual Approved and listed with the California O­ffice of the State Fire Marshall. It is listed with a protection ratings of 45 minutes, 90 minutes, 3 and 4 hours.

Our fire rated insulated rolling doors are also available in model number ERD21 with a SmokeShield® seal package. This optional package controls smoke and drafts while conforming to UL1784. This seal package will ensure that the smoke will also compartmentalized with the flames.   

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Materials and Finishes

Mounting Options


Drawing Generator
Need to see clearances and mounting details? Enter your opening dimensions into our Drawing Generator, and get custom generated drawings of your door with all the details.
Codes & Listings
  • ISO 9001:2008
  • Buy America Compliance
  • LEED® Compliance
See Codes and Listings page for detailed information.