This invention relates to {HEAD ~ an axial fan housing} having {TAIL ~ 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 
having
This invention relates to { HEAD ~ an axial fan housing } having { TAIL ~ 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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