Daikin McQuay 668861001 Board 319852 301 Key Benefits for Technicians Field Replaceable Key Benefits for Technicians Field Replaceable Design: Modular cartridge allows for rapid hot swappable installation without removing the main base unit from the conduit Durable Construction: The forged brass housing and chrome plated trim offer superior mechanical strength and corrosion resistance Integrated Sensing: Includes a dedicated return air sensor input for accurate environmental feedback and improved energy efficiency It is frequently employed in high demand environments such as data centers and industrial facilities where maintaining specific indoor conditions is non negotiable