The roof ventilators shall be of the Heritage Ultra vertical exhaust series as designed and manufactured by Fantech Pty. Ltd and be of the model numbers shown on the schedule/drawing.
The cowl shall be of galvanised steel unless specified otherwise. Impellers shall be Mixed-Flow design and driven by standard TEFC motors unless specified otherwise.
The windband shall incorporate quick-release toggle clamps to provide easy access for cleaning and maintenance.
All models shall be fully tested as a complete assembled unit to ISO5801: 2007 for air flow. Noise tests shall be based on ISO13347-3