Natural ventilators, which harness available wind forces to assist the exhaust action, include the following:

• Ridge Mounted Units (VRV) offer optimum ventilation position, and have a low profile to satisfy architectural requirements with minimum wind resistance.
• Slope Mounted Units (VSM) are most effective for spot ventilation.
• Fixed and Adjustable Louvres Fixed Louvres provide permanent ventilation, whereas adjustable louvres can be set to deliver variable amount of air.
• Automatic Release Ventilator (ARV) The Ventco A.R.V. is designed to automatically provide its maximum exhaust area under fire conditions, whilst providing a fully weathered unit in its normally closed position.
• Firelight MKII (Multipurpose ventilator) Combined natural and fire ventilator.

All ventilators are manufactured from embossed or plain galvanised steel, Galvalume or stainless steel, in either natural finish or with a Global-Sil™ finish in 12 standard colours. Global-Duro™ corrosion resistant coatings are also available. Units can also be manufactured in Aluminium.

Tables specifying size, mass and performance data for all units are available upon request. Please contact GRS Isando for further information.