Carrier P Series rooftop units are pre-wired and factory-tested in both cooling and heating modes. All 50P models feature an industrial grade cabinet with fully hinged access panels. Standard forward-curved supply fans provide superior supply fan performance of up to 4 in. external static pressure (ESP) while optional airfoil supply fans provide fan performance up to 6 in. ESP. Units are available in dedicated vertical and horizontal supply/return airflow models for constant volume (CV) or variable air volume (VAV) applications. Units are cooling only or available with a variety of electric or hydronic heating options. Units come with the ComfortLink™ DDC (direct digital control) communicating control system and hermetic scroll compressors on dual independent thermostatic expansion valve (TXV) controlled refrigeration circuits.