Specification for installation of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances, Gas fires, convector heaters and fire/back boilers (1st, 2nd and 3rd family gases)— 34 стр.
91.140.10 Central. Including burners and boilers for central heating systems / Системы центрального отопления. Включая горелки и котлы для систем центрального отопления
