A vacuum cleaner suction fan has blades with a profiled end section to reduce noise levels
摘要
<p>The electric motor driven fan has blades (13) which are curved and fitted between plates (9,16) to direct air through a diffuser. The outer tip of the blades are stopped (19) forming a gap (18) beneath a tab (17) terminating at a point close to the periphery of the fan plates.</p>
