a procurements of air filters for ahu installed at 2x660 mw, sstpp, mppgcl, dongalia khandwa , pre-filter for swas room, avr room & rio panel 9 mtr & ccr ahu, ( flange type ) size ( h-610xw-610x50 mm ) , pre filter for swas room & avr ahu ( flange type ) size ( h-305xw-305x50 mm ) , fine filters for swas room , avr room &rion panel 3.5 mtr ahu ( flange type ) size ( h-610xw-610x305mm ) , fine filter for swas room & avr room ahu ( flange type ) size ( h-305xw-305x305 mm ) , pre filters for c&i lab ahu ( flange type ) size - h-660xw-560x50 mm , finefilters for c & i lab ahu ( flange type ) size h-660xw-560x305 mm , pre filters for rio panel room el 3.5 mtr & 9 mtr ahu ( flange type ) sizeh-508xw-762x50 mm , finefilters for rio panel room el 3.5 mtr ahu ( flange type ) h-508xw-762x305 mm , pre filters for rio panel room el 9 mtr ahu ( flange type ) size h-610xw-305x50 mm , finefilters for rio panel room el 3.5 mtr ahu ( flange type ) size h-610xw-305x305 mm , pre filters for service building ahu ( box type ) size h-610xw-610x50 mm , pre filters for service building ahu ( box type ) size h-610xw-305x50 mm