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Glossary of Mold Related Terms

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Select a letter:

ABCDEFGHIJKLMNOPQRSTUVWXYZ

RA

Return Air

Radiant Heat Transfer

Radiant heat transfer occurs when there is a large difference between the temperatures of two surfaces that are exposed to each other, but are not touching.

Radon

A colorless, odorless gas that occurs naturally in almost all soil and rock. Radon migrates through the soil and groundwater and can enter buildings through cracks or other openings in the foundation. Radon can also enter well water. Exposure to radon can cause lung cancer.

Re-entrainment

Situation that occurs when the air being exhausted from a building is immediately brought back into the system through the air intake and other openings in the building envelope.

Re-entry

Situation that occurs when the air being exhausted from a building is immediately brought back into the system through the air intake and other openings in the building envelope.

Recirculated Air

Air removed from the conditioned space and used for ventilation, heating, cooling, humidification, or dehumidification.

RELs

Recommonded Exposure Limits (recommendations made by NIOSH)

Residual

Amount of a pollutant remaining in the environment after a natural or technological process has taken place.

Respirable Particles

Respirable particles are those that penetrate into and are deposited in the nonciliated portion of the lung. Particles greater than 10 micrometers aerodynamic diameter are not respirable.

Return Air

Air removed from a space to be then recirculated or exhausted.

RF

Radio frequency; portion of electromagnetic spectrum.

RH

Relative humidity

Risk

The probability of injury, disease, or death under specific circumstances. In quantitative terms, risk is expressed in values ranging from zero, which represents the certainty that harm will not occur, to one, which represents the certainty that harm will occur.

Risk Assessment

1. The use of factual information to define the nature and impact of an adverse effect on individuals or populations who have been exposed to hazardous materials and situations. 2. A quantitative or qualitative evaluation to determine the probability of an adverse effect to human health or the environment by exposure to specific pollutants.

Risk Communication

Exchange of information about health or environmental risks between risk assessors, risk managers, the general public, and other interest groups such as the news media.

Risk Management

The process of evaluating alternative responses to risks and selecting among them. Includes consideration of technical, scientific, social, economic, and political information.

Route of Exposure

The means by which toxic agents gain access to an organism such as ingestion, inhalation, dermal exposures; and intravenous, subcutaneous, intermuscular administrations.

RSP

Respirable suspended particles.

RTU

Roof top unit; a packaged AHU unit on the roof.