It provides the ability to view the interior of the air handling unit through clear safety glass,  eliminating the need to open the panel, disconnect circuits, or risk exposure to ultra violet light. Ductmate Galvanized Steel Products The AHU Viewport Panel provides a safe, effective means to view working UVC Emitters inside an air handling unit (AHU) with an insulated wall thickness of up to 3”.  The AHU Viewport Panel includes 2 layers of laminated safety glass with a 4”x2-5/8” clear window. 4” x 2-5/8” viewport 2 layers of safety glass Tested to 10” w.g. Ductmate's Online University was designed as value added service offered only to Ductmate's Distributors and their respective sales force.At the heart of our AVICARE HW system for broilers is our air handling unit (AHU).  Precisely designed to heat the entire shed floor area to our parameters as well as deliver just the correct volume of fresh pre-warmed and dried air in response to CO2 monitoring as the chicks grow.