The Gas Safety (Installation and Use) Regulations 1998 · S.I. 1998/2451View on legislation.gov.uk
Part E: GAS APPLIANCES
In this Part—
"flue pipe" means a pipe forming a flue but does not include a pipe built as a lining into either a chimney or a gas appliance ventilation duct;
"operating pressure", in relation to a gas appliance, means the pressure of gas at which it is designed to operate.
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