Owing to the coaxial arrangement, moreover, {HEAD ~ the two fans} 54 and 66 can share in common a single motor as their driving source, which, along with the simplified structure of {TAIL ~ coupling means}, leads to simplification of the apparatus in construction 
Owing to the coaxial arrangement , moreover , { HEAD ~ the two fans } 54 and 66 can share in common a single motor as their driving source , which , along with the simplified structure of { TAIL ~ coupling means } , leads to simplification of the apparatus in construction
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH