{TAIL ~ This invention} relates to an axial fan housing having {HEAD ~ a metallic shielding grating} covering an air passage opening, wherein the grating is formed with a series of vane like guide bars arranged in two or more concentric circular series 
{ TAIL ~ This invention } relates to an axial fan housing having { HEAD ~ a metallic shielding grating } covering an air passage opening , wherein the grating is formed with a series of vane like guide bars arranged in two or more concentric circular series
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