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