NF D35-326-1986
用25mj／M3丙烷气体和24.3mj／M3丁烷气体净热值工作的，并预定与燃烧物的VMC系统机械抽排装置连接的家用快速加热供水设备
Appliances for the instantaneous production of hot water for domestic use operating on propane-air and on butane-air of 25 mj/M3 and 24,3 mj/M3 net calorific value respectively and intended for connection to a VMC system mechanical extraction of combustio