Minimum flue sizes for gas fires, fluepipe sizing and clearance, how a flexible liner is fitted, and when a debris collection space is needed.
Approved Document J, Section 3, gives guidance for gas-fire flues in England. Once an appliance is chosen, check the flue against its installation instructions. The default sizes below apply when a flue is provided or refurbished before the appliance is known (paragraphs 3.17 and 3.19).
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