National Air conditioning engaged a 90 tonne crane with 15 tonne of counterweight to lift 3 units onto a school roof at Gulfview Heights.The crane had a lift height of 65 mtrs (195ft) and a reach of 42 mtrs (126ft ) to reach the furthest unit location
The units weighed 600kg each so the crane was nearing max reach capacity on the furthest unit . A closer location could not be found as the school is surrounded by green zone of trees