DIN EN 297 Berichtigung 1-2007 燃气中央供暖锅炉.带标称供热≤70kw气压燃烧器的B型锅炉.DIN EN 297-2005技术勘误
Gas-fired central heating boilers - Type B boilers, fitted with atmospheric burners of nominal heat input not exceeding 70 kW; German version EN 297:1994 + A1:1994 + A2:1996 + A3:1996 + A4:2004 + A5:1998 + A6:2003, Corrigenda to DIN EN 297:2005-10; German