Australian Frost Fans is the sister business to New Zealand Frost Fans, which manufactures the FrostBoss™ range of frost fans to protect crops from frost and cold injury. The FrostBoss™ C49 (4-blade machine) is the best-selling machine in Australia and New Zealand. The FrostBoss™ C49 was developed with help from former Team New Zealand aerodynamics research engineer, Richard Karn, to optimize noise reduction by using a greater blade working area and slower rotational speed than a 2-blade fan. In addition, the much higher blade passage frequency of the 4-blade fan means the noise signature no longer has a low frequency beating sound, similar to an Iroquois helicopter. Along with the FrostBoss™ C59 (5-blade machine), the FrostBoss™ C49 is the quietest machine on the market. Over 400 FrostBoss™ wind machines are sold annually throughout New Zealand, Australia, Turkey, Portugal and Canada covering a variety of crops. Together, the two businesses regularly service more than 2000 machines in NZ and Australia and its sophisticated computer programming option enables growers to access real-time monitoring of fans around the world. As well as supply and installation of FrostBoss™ frost fans, Australian Frost Fans service and upgrade most makes of frost fan.