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the best question to ask is the standard details of fcu,ahu,fahu,water heater and there connections details for chilled water piping connections and the penetration of duct,chilled water pipe and drainage pipes.the details of air outlets and there installation details
Give him HVAC Drawings and ask him how to read them
Most important ask them to draw standard details of installation of units or duct/pipe penetrations through walls and slabs or installation of air inlet outlets
