2017GB/T 1236-2017 Industrial fan—Performance testing using standardized airways
2000GB/T 1236-2000 Industrial fans-Performance testing using standardized airways
1985GB 1236-1985 Test method for aerodynamic performance of ventilator
GB 1236-1985 Test method for aerodynamic performance of ventilator was changed to GB/T 1236-2000 Industrial fans-Performance testing using standardized airways.