annual comprehensive, preventive and corrective maintenance of ac machines of different capacities installed at utsab mancha, west bengal labour welfare board, p-3, c.i.t. scheme vii m, kankurgachi, kolkata - 700054.- a ) 1.0 tr split type room air-conditioner machine. 3 b ) 1.5 tr split type room air-conditioner machine. 4 c ) 2.0 tr split type room air-conditioner machine. 5 d ) 5.5 tr single outdoor and hat type single indoor of 5.5 tr capacity with ducting. 6 e ) 8.5 tr single outdoor and hat type single indoor of 8.5 tr capacity with ducting. 7 f ) 11.0 tr single outdoor and hat type single indoor of 11.0 tr capacity with ducting. 8 g ) 17.0 tr single outdoor and hat type twin indoor of 8.5 tr capacity with ducting.