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Glossary terms for letter 'o'

Obscured Glass Glass through which light can pass but objects are blurred. Glass Fitters & Glaziers

Off Peak Heating By which water heaters are supplied with energy during off-peak periods. Air Conditioning Equipment Installation, Electricians & Electrical Contractors

Offset A distance measured from a survey mark. Building Surveyors

Oil Trap A sump to capture and prevent oils and greases entering drainage systems.

Open Drain An open channel by which surface water is carried away. Plumbers & Gasfitters

Outlet (Electrical) The same as power points or general purpose outlets. Electricians & Electrical Contractors

Overflow pipe A pipe installed to discharge excess liquid. Plumbers & Gasfitters