### action | improvement:

Ventilation
* Most ventilation reduces moisture.
* Some ventilation prevents growth.
* allows for acceptable levels of temperature, humidity, and elimination of odors
  - the heated air to escape from the attic before it can build up
* alone can cool a house during many times of the year.
* also limits the spread of fire and smoke, thus reducing damage.
* can also accelerate removal of water and drying of surface materials
  - force fresh air into a space as well
* defense against excess moisture and foundation decay.
* depends upon a pressure difference between the lungs and the outside atmosphere.
* good way to get rid of harmful substances in the air.
* increases chances.
* is also more than just a way to keep from passing out from fumes
  - vital because still air can create the perfect conditions for fungal diseases
  - an expensive and inefficient means of dealing with secondhand smoke
* is an important aspect of animal housing, particularly closed housing
  - horse trailer design
  - consideration in air quality
  - old and successful method of reducing emotional tension
  - another factor that is related to the animal's native habitat
  - crucial in today's well-insulated homes, helping to insure good indoor air quality
  - essential to most room areas to prevent unpleasant living conditions
  - impaired by abdominal distention and patient position
* is important for improved drying conditions, especially during high humidity
  - to keep moisture from forming
  - located in offices
  - mechanical systems
  - necessary to reduce hazardous fumes and vapors produced when using lasers
* is one of the best solutions to indoor air quality problems
  - main engineering controls to control heat stress
* is the best way to control exposure to harmful substances in the air
  - breathing in of air or oxygen
  - exchange of air between the external environment and the alveoli
  - exchanging of air in a given space
  - free entry and circulation of air in a space such as a room
  - industry's latest strategy to derail clean indoor air
  - introduction of exhaust gases into the propeller
  - key factor to reducing the airborne concentrations
  - least expensive and most energy-efficient way to cool buildings
  - mechanics of breathing in and out
  - most effective way to dry out structure interiors
  - primary engineering control used to limit formaldehyde exposure
  - process of moving air into and out of the lungs
  - unlikely to be a limiting factor in exercise in a healthy subject
* is very important during the incubation process
  - when using heating devices
* keeps ethylene and carbon dioxide from building up to damaging levels.
* key factor in keeping sheep clean and dry.
* mechanical process.
* occurs passively when individuals move.
* plays a large role in providing moisture control and reducing summer cooling bills.
* prevents suffocation that can be caused by a heater consuming oxygen.
* reduces manure moisture
* removes indoor air and adds outside air to dilute the overall level of allergens.
* system of removing the air with lead dust in it.
* uses two physical properties of air to be effective.

### action | improvement | ventilation:

Attic ventilation
* allows moisture and hot air to escape from the attic during the summer months.
* is the traditional way of controlling temperature and moisture in an attic.
* reduces summer heat build-up and prevents winter moisture condensation.

General ventilation
* flushes the atmosphere by supplying and exhausting large volumes of air.
* is meant for a large area such as a building s air handling system.
* provides only modest protection against toxic gases, aerosols, vapors and dusts.