In building; hard landscaping refers to elements including paths, driveways, garden walls and patios.
In electrics; harmonic content is the number of frequencies in the output waveform in addition to the primary frequency (50 or 60 Hz.). Energy in these harmonic frequencies is lost and may cause excessive heating of the load.
In building; a header is a brick or block laid across a wall to bond together its two sides. It also means the exposed end part of a brick.
In building; herringbone strutting is the type of cross bracing used between floor joists to increase stiffness.
In building; the hip is the sharp edge of a roof from ridge to eaves where the two sides meet.
In building; a hipped roof is a roof with sloping ends instead of vertical ones.
In electrics; a hole is the vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.
In solar system design; a hybrid system is a solar electric or photovoltaic system that includes other sources of electricity generation, such as wind or diesel generators.
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