A BREATH OF FRESH AIR Greenwood was founded in 1879 and today is a market leader in the design, manufacture and specification of SMART ventilation systems for the new build and refurbishment residential markets. Owned by the Zehnder Group, today we operate from our head office in Camberley. We have invested in our products, services and people to deliver the best ventilation experience for the specifier, the installer, the homeowner or really anyone who interacts with it during a build or refurbishment project. Specialists in MVHR and Passive House.