NVR Rectangular Roof Stack Unit
The Price rectangular natural ventilator,model NVR, is a ceiling mounted unit which is designed to relieve air to the outdoors in cooling mode and exchange air with the outdoors in heating mode.
The NVR features an integral fan which serves to draw air through the roof opening when a "boost" is required in cooling mode, as well as disrupt cool air motion in heating mode, thereby
reducing the risk of draft.