HVAC Shop Blog
Testo 420 Flow Hood: Air Inlet/Outlet Measurement Guide
Matching the right Testo 420 flow hood to the outlet is the first step to a commissioning result you can sign off on. This guide covers all four hood sizes in the Testo 420 range, explains how to select the right option for square, linear and oversized outlets, and walks through flow straightener maintenance and storage. Practical advice for ARCtick-licensed HVAC-R techs, mechanical contractors, and anyone doing volume flow measurement on Australian commercial or residential sites.