blocked drains orpington


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Added: 2018-06-29
Category: boiler service
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Highefficiency sealedcombustion

High-efficiency sealed-combustion units generally produce an acidic exhaust gas that is not suitable for old, unlined chimneys, so the exhaust gas should either be vented through a new duct or the chimney should be lined to accommodate the acidic gas (see the section on maintaining proper ventilation below).

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