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HHI-Pedia Entries

N95 respirator	An essential tool used to protect people from hazardous fumes during certain jobs.
Nanometer	A distance unit representing one-billionth of a meter.
nanoparticle	An ultra-small, highly microscopic particle.
Nanotechnology	Nanotechnology describes the creation and use of materials, devices and systems which control matter at the atomic or molecular level or “nanoscale”.
National Coalition Against the Misuse of Pesticides (NCAMP)	A nonprofit organization devoted to pesticide safety and alternative, less toxic methods of controlling pests.
Natural Aspiration	The negative pressure in a chimney caused by rising, warm combustion by-products. Often referred to simply as draft.
Natural Draft	The negative pressure in a chimney caused by rising, warm combustion by-products. Often referred to simply as draft.
Natural Pressure	An air-pressure difference between the indoors and the outdoors, induced by natural phenomena such as wind, stack effect, and diffusion.
Natural Ventilation	Random air movement into and out of a house caused by natural pressures.
Negative Ions	Negatively charged atoms or groups of atoms that will cling to oppositely charged surfaces.
Negative Pressure	When the air pressure inside a house or room is less than the atmospheric pressure outside the house or room.
Net Free Area (nfa)	The amount of unobstructed open area of a grille, inlet, or outlet.
Neurotoxin	A substance that is poisonous to the nervous system, spinal cord, brain, etc.
Neutral Pressure	Air pressure inside a house that is equal to the atmospheric pressure outside the house.
Neutral-Pressure Plane	That part of a house that experiences neutral pressure as a result of stack effect, or as a result of combined pressures.
Noise Pollution	The traditional definition of noise is 'unwanted or disturbing sound'.
Nontoxic	Nontoxic is defined as not being harmful at concentrations normally used. However, most people believe that it means a substance is innately harmless — and this just isn’t so.

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