The AAF®-HermanNelson® Model AV unit ventilator is designed for easy access, cleaning, and servicing. The unit features modular design components such as a one-piece welded frame for long-term structural strength and a modular fan section that can be removed as one piece for service. The units employ GentleFlo™ air moving technology, face-and-bypass damper air control, and a draw-through design.