Only one out of 12 electric fans recently tested for safety by two watchdogs passed all the assessments for insulation and heat resistance.

In a joint study by the Consumer Council and the Electrical and Mechanical Services Department, nine fans were found to have insufficient space between their insulated windings and the core of their motors, exposing users to greater risk of electric shocks. Pricerite, Mitsubishi, Midea and German Pool were among the brands whose equipment fell into this category. Two fans, from manufacturers Fatat and Turbo, failed a heat resistance test.

Only minor non-compliance was detected in each sample and no recalls would be needed, a department spokeswoman said, adding that using the fans under normal conditions would not pose any risk.