Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| machine room |
1.
engine room, a room in which mechanical equipment is permanently installed and
operated.
2. main computer room. |
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| magnetic flux |
lines of force that exist about a magnetized
body and collectively constitute a magnetic field |
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| magnetic flux density | degree of concentration of magnetic lines of
force |
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| main |
1. pipe or duct for distributing to or
collecting flowing fluid from various branches. 2. regulated compressed air piped to pneumatic
controls |
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| maintainability | specific period within which a system or
facility can operate in an economical, fully restored condition |
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| maintenance (maintenance program) |
maintenance concept in terms of time and
resource allocation. It documents the objectives and establishes the criteria
for evaluation and commits the maintenance department to basic areas of
performance such as prompt response to mechanical failure, maintenance, and
attention to planned functions that protect the capital investment and minimize
downtime or failure response |
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| management information function |
provision of information useful for management
of a building environment, and/or its energy efficiency and/or HVAC system
maintenance |
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| manifold |
portion of a main in which several branches are
close together. Also, a single piece in which there are several fluid paths |
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| manometer |
instrument for measuring head or pressure;
basically a U-tube partially filled with a liquid, usually water, mercury, or
light oil, so constructed that the difference in level of the liquid legs
indicates the pressure exerted on the instrument |
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| manufactured home |
manufactured building intended to be used as a
dwelling. Note: The U.S. Department
of Housing and Urban Development (HUD) has adopted a legal definition, found in
42 USC 5402. |
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