Dan Veeneman offers tips cleaning large ventilation fans in dairy operations. His advice can also be applied to any ventilation fan on the farm, in shops or at home.
Source: Progressive Dairyman, May 16, 2018. Link.
Keeping fans, curtains, inlets and baffles clean will go a long way in extending the life of your ventilation equipment. Fans will lose up to 30 percent of their performance with dirty blades.