True or False: An aluminum flush door usually has a core of hardboard and honeycomb-patterned paper.

An aluminum flush door typically has a core that consists of materials like hardboard and honeycomb-patterned paper. This design provides a combination of strength, light weight, and thermal insulation, which are important characteristics for many applications, including those in commercial and industrial settings. The honeycomb structure, which is sandwiched between two aluminum sheets, helps to maintain the door's rigidity while also reducing weight, making it easier to handle and install.

While various manufacturers may offer different core configurations, the most common design features the hardboard and honeycomb combination. Therefore, recognizing this standard helps in understanding the typical structure of aluminum flush doors. Consequently, affirming that this statement is true is consistent with the general knowledge of door construction in fire service and safety standards.