?8502.In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases?
发布于 2021-02-18 22:11:06
【单选题】 A ?Either a combustion air relief valve or a differentia! B ?pressure regulator. C ?Only a differential pressure regulator can be used. D ?Only a combustion air relief valve can be used.