МОНГОЛ УЛСЫН СТАНДАРТ
MNS EN 806-5 : 2021 2 EN 12729, Devices to prevent pollution by backflow of potable water — Controllable backflow preventer with reduced pressure zone — Family B - Type A EN 12897, Water supply — Specification for indirectly heated unvented (closed) storage water heaters EN 13076, Devices to prevent pollution by backflow of potable water — …