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Why Are Hollow Metal Doors Hollow?


As an industry professional, one of the most common questions we get from a person new to the door industry is that they need a metal door but do not want it hollow; they need an insulated metal door. The first thing to understand about the term hollow metal door is that it does not mean the door is not insulated. In fact, all commercial hollow metal doors have some type of insulated core. Cheaper hollow metal doors feature a honeycomb insulated core, while more expensive higher quality models feature a polystyrene core. The term "hollow metal" refers to the construction of the metal door. Let's explore what this means.

"Hollow Metal", What Does It Mean

Hollow metal is referring to the design of the metal door. Hollow metal doors are constructed using sheets of steel. The steel sheets act as a shell, wrapping around the insulated core. So when a contractor refers to a hollow metal door, he is meaning an insulated steel door.

Hollow Metal Vs Hollow Core

If you are familiar with residential interior doors, you may be aware of hollow core doors. Hollow core doors are just as they sound, they are hollow at the center of the door. Hollow core doors are typically interior home wood doors. These doors are constructed from thin wood sheets, with a hollow core. Whereas hollow metal doors are constructed from steel sheets that make up the door shell, and the center is filled with honeycomb or a polystyrene core. The term hollow metal should not be confused with hollow core.

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