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