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Glossary terms for letter 'O'


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

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Glass & Glazing
Off Peak Heating
By which water heaters are supplied with energy during off-peak periods.

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Air Conditioning, Electrical
Offset
A distance measured from a survey mark.

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Surveying
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.

Related Categories
Plumbing & Gasfitting
Outlet (Electrical)
The same as power points or general purpose outlets.

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Electrical
Overflow pipe
A pipe installed to discharge excess liquid.

Related Categories
Plumbing & Gasfitting