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Category: Glossary

PSI

Pounds per square inch.

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Media

The material in a filter that traps and holds the impurities. These HVAC filter media include fiberglass filter media, polyester filter media, dog hair filter media, blue/green filter media, charcoal filter media, and others.

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Latent Heat

A type of heat, which when added to or taken from a substance, does not change the temperature of the substance yet enables the heat energy to change its state.

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NEMA

National Electrical Manufacturing Association.

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PSIA

Pounds per square inch, absolute.

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NEC

National Energy Council / National Electric Code.

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Kilowatt (kW)

1,000 watts. A common unit of electrical consumption measured by the total energy created by one kilowatt in one hour.

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Ignition

The lighting of a gaseous mixture to the temperature at which combustion takes place.

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HVAC

Heating, Ventilating and Air Conditioning.

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Humidity, Relative

A measure of the percent of moisture actually in the air compared with what would be in it if it were fully saturated at that temperature. When the air is fully saturated, its relative humidity is 100 percent.

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