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