Controls that vary airflow through an air outlet, inlet, or duct. A damper position may be immovable, manually adjustable, or part of an automated control system.

A length of pipe ending at a fitting through which water flows only when the fitting is opened.

A cleansing agent capable of penetrating biological films, sludge and sediment and having the ability to emulsify oil and hold materials in suspension. Water treatment specialist have developed detergent formulations which are capable of thoroughly cleaning components which are difficult to access and inspect, such as cooling tower fill.

A chemical that acts as a poison by means of causing adverse effects on the developing organism, including death, structural abnormality, altered growth, and functional deficiency.

Investigation or analysis of the cause or nature of a condition, situation, or problem.

5th division of the C.N.S.

Additional air beyond that which is needed to provide combustion. This may either be within the combustion chamber as excess air or as induced flow in the exhaust stack.

A glass or plastic slide coated with culture media on which microorganisms can be grown and estimated. Legionella does not grow on these media.

One of three groups of antimicrobials registered by EPA for public health uses. EPA considers an antimicrobial to be a disinfectant when it destroys or irreversibly inactivates infectious or other undesirable organisms, but not necessarily their spores. EPA registers three types of disinfectant products based upon submitted efficacy data: limited, general or broad spectrum, and hospital disinfectant.

The effect of a substance on a body increases as the dose increases; theoretically, the body may respond differently at different dose levels of a given substance.