The SVTC unit comprising of centrifugal impeller, motor and all assembled components, shall be certified for high temperature operation at 300°C and 400°C for 2 hours, the range shall have been type tested to EN12101-3:2015. The Axus Main exhaust units and ancillaries shall have been type tested and certified for high temperature operation of 300°C for 2 hours to EN12101-3. The units shall be either 2 speed or inverter driven providing, low speed for day to day environmental extract and one off operation for emergency extract. Inlet guards are provided for safety purposes and to prevent debris being sucked through the fan. A specially designed airflow deflector directs the jet stream from the fan at the required angle sufficient to overcome the natural buoyancy effect of the smoke. The car park impulse units shall be the SVTC type and the main Exhaust units shall be the high temperature AXUS type all as manufactured by Nuaire.