Hazardous-Location Air Conditioner. UL listed for Class 1, Division 2, Groups A, B, C, D hazardous locations. These air conditioners have an adjustable temperature control, adjustable louvers for directing airflow, and a slide-out chassis for easy maintenance. Units are single phase, operate on 208-230 VAC, 60 Hz, and have leads for hardwiring. Mount in a window 27 7/8" to 42" wide or through a wall with a maximum thickness of 6". MCM1817K79 requires a 16 3/8" Ht. x 26 3/16" Wd. wall cutout. Perfect for cranecabs.