Known as the ‘Hot Climate’ or ‘Export fan’ this metal fan is moves the most air but also absorbs the most power. The 11 blade plastic fan 12G2129 is quieter and is the most efficient in terms of power absorption and air movement. The single 2A997 or 4 blade type is good at higher engine speeds but is noisy and less efficient at lower speeds. Will not fit with timing covers with breather cannister fitted. The curved paddles should be fitted towards the radiator.