Is there an easy way to measure for proper gaps on a fire-rated door opening?



YES. There are products available for inspectors, technicians, and installers that are simple to use and not expensive. The product we use is called “The Door Gap Gauge” and is made in the USA by PL2.

The gauge is marked and sized to measure the top of the door, hinge side, latch side and bottom of doors as well as the gap in pairs of doors. A product like this should be in every inspectors, technicians, and installers toolbox. It can save on call back at final inspection.


In addition to a broad offering of product and service solutions, IDN offers pre-sale and post-sale technical support.  The benefit to you is that we make security simple.  Whether your task is related to high-security systems, electronic access control, door installation, or other, our experts are here to assist.  Just let us know how we can help.

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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