Providing Of Operation And Maintenance Of Hvac System (heating, Ventilation And Air Conditioning System) - Major Preventive Maintenance Of Window Air Condition One And Half Ton Or Two Ton (for Detail Refer Chapter-11 Of Detail Scope Of Work),operation And Maintenance Of Hvac System (heating, Ventilation And Air Conditioning System) - Major Preventive Maintenance Of Split Air Conditioner One And Half Ton Or Two Ton (for Detail Refer Chapter-11 Of Detail Scope Of Work),operation And Maintenance Of Hvac System (heating, Ventilation And Air Conditioning System) - Major Preventive Maintenance Of Water Purifier Cum Water Coolers (for Detail Refer Chapter-11 Of Detail Scope Of Work),operation And Maintenance Of Hvac System (heating, Ventilation And Air Conditioning System) - Major Preventive Maintenance Of Refrigerators Deep Freezer Bottle Coolers (for Detail Refer Chapter-11 Of Detail Scope Of Work),operation And Maintenance Of Hvac System (heating, Ventilation And Air Conditioning System) - Major Preventive Maintenance Of 1 Ph