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BSI BS 5871-1 Specification for the installation and maintenance of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances Part 1: Gas fires, convector heaters, fire/back boilers and heating stoves (2nd and 3rd family gases)

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BSI BS 5871-1 Specification for the installation and maintenance of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances Part 1: Gas fires, convector heaters, fire/back boilers and heating stoves (2nd and 3rd family gases)

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