As mentioned NEVER run a gas pipe through an un vented space.
gas pipes must never be encased in an unvented space.
NEVER run a gas pipe through an un vented space.
http://www.legislation.gov.uk/uksi/1998/2451/made said:The Gas Safety (Installation and Use) Regulations 1998
Part D
paragraph 19
(6) Where any installation pipework is not itself contained in a ventilated duct, no person shall install any installation pipework in any shaft, duct or void which is not adequately ventilated.
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