Air distribution products--grilles, register, diffusers (GRD), and air terminal units (ATU) offer functional and aesthetic value to HVAC systems. ATU's (VAV boxes) regulate airflow for maximum comfort. The Air Conditioning Distribution Box is a critical electrical component that centralizes power distribution for cooling systems while providing protection and ease of maintenance. This article explains what a distribution box does, typical configurations, sizing guidelines, installation. Home / blog / Ultimate Guide to Distribution Boxes (DB Boxes): Types, Components, Applications, and How to Choose the Right One For procurement professionals, electrical contractors, and project managers, choosing the right Distribution Box (DB Box) is a critical decision that directly impacts. Variable Air Volume (VAV) boxes, also called VAV terminal units or VAV dampers, are zone-level air distribution devices that regulate airflow to maintain comfortable conditions in individual spaces. We'll chat about what each one does, where it shines, and then dive into how to choose the perfect box for your needs. It integrates power distribution, protection, and monitoring capabilities, and is responsible for distributing power to entire commercial or residential. Standard, cooling-only VAV boxes consist of a VAV controller with an actuator that controls a damper.