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HHI-Pedia Entries

Teratogen	A substance that interferes with the development of a fetus or causes birth defects.
Terpene	Terpenes are hydrocarbons - organic compounds made up of hydrogen and carbon - mainly from plants, and the main constituent of essential oils.
The Clean Trust	Formerly known as The Institute of Inspection, Cleaning and Restoration Certification (IICRC), The Clean Trust is an ANSI-accredited standards setting body for the flooring inspection, floor covering and specialized fabric cleaning, and disaster restoration industries.
Thermographic Inspection	Thermographic inspection measures surface temperatures using infrared light (light that is in the heat spectrum) to detect temperature variations of the building's "skin", showing warmer areas in lighter colors and cooler areas in darker colors.
Through-the-Wall Vent	A deliberate opening in an exterior wall through which air moves. The direction of air movement can be inward or outward, depending on the pressure difference between the indoors and the outdoors.
Total Dissolved Solids (TDS)	Total dissolved solids are dissolved particles found in water that are small enough to pass through a .45 µm filter.
Total Recovery Efficiency (TRE)	A measurement that includes latent heat recovery, used in determining the amount of energy passed between airstreams in a heat or energy recovery ventilator.
Total Solids (TS)	Total solids are the weight of total dissolved solids (TDS), total suspended solids (TSS) and settleable solids per unit volume of water.
Total Suspended Solids (TSS)	Total suspended solids, sometimes called filterable solids, are typically larger particles found in water that will not pass through a .45 µm pore-diameter filter.
Toxic substance	A chemical or agent that constitutes a potential hazard to human health at acute or chronic exposure levels.
Toxoplasmosis	A concern for pregnant women and anyone with a weakened immune system.
Tracer Gas	A gas, often inert, that is used to evaluate the air-exchange rate in a house.
Transfer Duct	A short duct connecting two rooms through which air can move when pressure imbalances occur between the rooms.
Transfer Grille	An opening between two rooms through which air can move when pressure imbalances occur between the rooms.
Trisodium phosphate (TSP)	A granular, alkaline cleaning product sold in hardware and paint stores.
TSCA	The Toxic Substances Control Act (TSCA) requires EPA to compile, keep current, and publish a list of each chemical substance that is manufactured or processed in the United States.
Tube Fan	A ventilating fan made to attach a duct at each end.

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