BS EN 525:2009 pdf download – Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW 4.2.1.2.1 Appliances designed for use on gases of the first and second families Category II 1a2H : Appliances capable of using gases of Group a of the first family and gases of Group H of the second family. The first family gases are used under the same conditions as for Category I 1a . The second family gases are used under the same conditions as for Category I 2H . 4.2.1.2.2 Appliances designed for use on gases of the second and third families a) Category II 2H3B/P : Appliances capable of using gases of Group H of the second family and gases of the third family. The second family gases are used under the same conditions as for Category I 2H . The third family gases are used under the same conditions as for Category I 3B/P . b) Category II 2H3+ : Appliances capable of using gases of Group H of the second family and gases of the third family. The second family gases are used under the same conditions as for Category I 2H . The third family gases are used under the same conditions as for Category I 3+ . c) Category II 2H3P : Appliances capable of using gases of Group H of the second family and gases of Group P of the third family. The second family gases are used under the same conditions as for Category I 2H . The third family gases are used under the same conditions as for Category I 3P . d) Category II 2L3B/P : Appliances capable of using gases of Group L of the second family and gases of the third family. The second family gases are used under the same conditions as for Category I 2L . The third family gases are used under the same conditions as for Category I 3B/P . e) Category II 2L3P : Appliances capable of using gases of Group L of the second family and gases of Group P of the third family. The second family gases are used under the same conditions as for Category I 2L . The third family gases are used under the same conditions as for Category I 3P . f) Category II 2E3B/P : Appliances capable of using gases of...
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