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HHI-Pedia Entries

R-value	How effective is your insulation?
Radiant Cooling	Radiant cooling cools a floor or ceiling by absorbing the heat radiated from the rest of the room.
Radiant Heating	Forced air heating is not the only option.
Radon	A naturally occurring radioactive gas, often released from soil and rocks.
Radon Daughters	The natural radioactive decay products of radon, some of which release harmful radiation.
Radon Progeny	The natural radioactive decay products of radon, some of which release harmful radiation.
Random Holes	The miscellaneous cracks, gaps, and openings in a house between the indoors and the outdoors through which air can move.
Range fan	The hood has a removable filter that’s essential for reducing airborne grease.
Recirculate	To move air through the living space without adding fresh air or removing stale air.
Recirculating Range Hood	A ductless range hood, one that is not connected to the outdoors.
Recyclable	Recyclable only means recycled if the consumer, middle man and manufacturer all participate.
Recycled	Only a limited number of items are created of 100% post-consumer material.
Recycling Symbol, Plastic	How to “read” plastic containers for recycling.
Relative Humidity (RH)	The amount of moisture in air compared to the maximum amount of moisture that air at that temperature can contain, usually expressed as a percentage.
Return Air	Air from a living space that enters an air handler, such as a furnace or air conditioner, and is returned back to the space.
Rotary Core	A slowly spinning wheel typically made of corrugated material (metal, plastic or treated paper) tightly stacked; used in some heat or energy recovery ventilators to transfer heat and moisture between two airstreams.
Rubber Gloves	Some jobs require greater hand protection than others.

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Information provided by The Healthy House Institute is designed to support, not to replace the relationship between patient/physician or other qualified healthcare provider.