Closed guard. Elivent fan guards are built from steel rod or AISI 304 stainless steel and come in 3 and 5 mm diameter with 20 mm openings.
The manufacturer is responsible for maintaining the safety distance between fan guard and impeller, in compliance with safety standards: UNI EN ISO 13857;2008 – UNI EN 349;1994 – safety distance – safety of machinery.