tender for impeller with 24 blades of mvrh suitable for m/s. bbl make duct confirming to clw spec no.clw/es/b-14, duct specification as follows: (i) front enclosure window dia:530 mm . (ii) back enclosure platedia: 815 mm, (iii) impeller dia:750 mm. (iv) air delivery:422 cu metre/min. (v) speed: 1465 mm.