Automatic Smoke Vents (AOVs) or Smoke Dispersal units are available in both 90 degrees and 140 degree opening. There are size limitations due to weight, so please ask. CE marking is also available on certain specifications if required by your architect or building control officer. AOVs will have hidden, boxed actuators. The units will fit directly to the roof deck or to a pre- constructed builders kerb. A vertical kerb will keep the free vent area a constant size. The free vent area is normally at least a 1m2 in size. Please check with your architect or building control officer for your exact requirements. All units are operated using a 24v control panel with battery backup. Other items such as smoke alarms, break glass, key switches etc may also be required. The roof dome with be in either double or triple skin polycarbonate and is available in clear, obscure, opal or bronze tints. White polyester powder coated as standard but other RAL colours available. This can also meet current building regulations.