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Must I have a “gas drain” behind my 3 way refrigerator?

Clause 6.12.2 calls for a 500mm² (25mm dia) hole at the bottom / rear of the refrigerator recess (through the floor) to allow any unburned gas to escape. It also states the lower vent might satisfy this requirement.
Most installation manuals state it is required (so that makes it mandatory) and most lower wall vents have too high a frame to comply.