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D35-331/A4
Modificatif 4 à la norme NF D 35-331 de janvier 1979.
WITHDRAWN
Boilers with gas burners for hot water central heating. - Chaudières à brûleurs atmosphériques utilisant les combustibles gazeux pour chauffage central par l'eau chaude.
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Gaz-fired central heating boilers. Type B11 and B11BIS boilers fitted with atmospheric burners of nominal heat imput not exceeding 70 kw.
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