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