01 ) Supply of roof mounted air conditioning system without ' trough ' to Specn. No. RDSO/ 2007/ EL/ SPEC/ 0055 Rev 2 or latest. Material to be procured from CLW approved source or their authorized dealers as per CLW item ID no. 2100134. 02 ) Supply of roof mounted air conditioning system without ' trough ' to Specn. No. RDSO/ 2007/ EL/ SPEC/ 0055 Rev 2 or latest. Material to be procured from CLW approved source or their authorized dealers as per CLW item ID no. 2100134.