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| Manifolded installation
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Paralleling of water heaters for large hot water demand applications. |
| Manila paper
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Facing paper that covers the exposed side of gypsum wallboard to protect it prior to installation. |
| Manometer
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An instrument that measures air pressure differences between locations. Tubes are usually attached to a manometer and run to the spaces where pressures are measured. |
| Manometer, dry
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A different type of draft gauge, this device is used to measure slight changes in a low-pressure system, such as an HVAC system. When pressure changes occur they are measured by using a bellows and a pointer moving across a scale. The inside of the sealed flexible bellows, is connected to the source of low pressure so that the bellows will expand or contract with any change in pressure. The amount of change can be noted by reading the scale. |
| Mansard roof
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A roof with two sloping planes of different pitch on each of its four sides. The lower plane is steeper than the upper, and may be almost vertical. |
| Mansard roof
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A four-sided roof that slopes upward from the edge of the roof to a square peak. This type of roof has two different slopes around all sides of the structure, the upper of which may be nearly horizontal and the lower nearly vertical. |
| Mansion
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A large, imposing, stately home. |
| Mantel
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The facing around a fireplace of stone, marble, wood, etc. or the shelf over any fireplace opening. |
| Mantelpiece
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The wood, brick, stone or marble frame surrounding a fireplace, sometimes including a mirror above. |
| Mantle
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Element used in a gas lap designed to emit a bright light. Made in the shape of a bag of coarse woven cloth, it is tied over the end of a gas pipe. A lighted flame causes it to burn briefly and turn into ash, which retains both the shape and strength of the original material but is brittle. The mantle diffuses the gas, allowing it to mix with air. The mantle glows brightly due to the gas that flows through and burns at its surface, making it useful as portable lanterns and exterior lighting. |
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