Ventilation necessity

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• Why ventilation is important?
• Benefits of mechanical ventilation
• Indoor Air Quality Improvement

Common Household Chemicals

Cleaning supplies Paints and solvents Formaldehyde from furniture, carpet and builiding materials Pesticides Volatile organic compounds(VOC) Odors

Why ventilation is important?
1. Propagation of air conditioning systems
	"As air conditioning systems widely propagate, closed style houses are increasing since they are advantageous over open style houses with respect to the improvement of air conditioning effects. Air conditioning in closed rooms may lead to poor ventilation of rooms. Special attention must be paid to this point when a direct combustion type heater is used in particular."
2. Increase of heat sources and exhaust gas
	"With the improvement of people’s living standard combustion apparatus and other cooking appliances including water heaters are widely employed and enhanced in quality. As a result, the volume of exhaust gas (consumption of air) is increasing, giving rise to occurrence of accidents due to lack of oxygen which are often closed up as social problems. Therefore, it is now a must for us to solve these problems if we want to build houses comfortable to live in."
3. Airtight structure of building
	"Modern houses are structurally quite different from traditional style houses. Reinforced concrete buildings, collective housing and prefabricated houses are increasing and most of these houses are highly airtight using aluminum sashes which hardly allow natural ventilation."

4. Improvement of living conditions

"Compared with conventional houses, the number of rooms in houses is gradually increasing and those individual rooms such as living rooms, bedrooms and children’s rooms should come to have their particular characteristics. Accordingly, the ventilating system must be designed taking the conditions of each individual room into consideration. Furthermore, constructions that require ventilation such as a garage are increasing year after year."

5. Increase of housing compounds and high buildings
	"High-rise housing compounds are especially increasing in big cities. Accordingly, the ventilation systems are required to withstand very severe conditions such as strong upper air current. It is also necessary to provide the common ventilation facility with perfect protections and sanitations."

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Benefits of mechanical ventilation
1. Ventilates
	"Stagnant air, pollutant and smoke are expelled. Kitchens, restaurants, theaters and industrial space are kept free of these irritants remain pleasant and comfortable."
2. Deodorizes
	"Offensive odors are quickly removed. Without opening the window! Snap on the fan, and cooking odors and all others are cleared from the room."
3. Removes dust
"Dust and soot which could settle on walls and furniture are efficiently removed by ventilating fans."
4. Dehumidifies
	"Operation of the ventilating fan does away with moisture. Fights humidity. Keep room healthy for everyone."
5. Control air flow
	"Ventilating fans keep air circulation in rooms. Improve air conditioning effects and maintain comfort even in hot, stuffy weather."

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Indoor Air Quality improvementt
The first step to improve indoor air quality should be to reduce or remove the source of the pollutants. Unfortunately, indoor pollutants are virtually impossible to eliminate completely, creating the need for a second step – ventilation. Ventilation is divided into “Natural Ventilation” and “Mechanical Ventilation”. Natural ventilation is neither consistent nor reliable since it relies heavily on wind and weather conditions. Mechanical ventilation removes stale, moist, polluted air and replaces it with fresh outside air by using a fan.
Natural ventilation	Mechanical ventilation

   Two widely used methods in today’s building industry are continuous and intermittent ventilation.

Continuous ventilation
	Sometimes referred to as general, central, whole-house or primary ventilation. Continuous ventilation is used to remove stale air and provide fresh air on a slow, continuous basis

Intermittent ventilation
	Sometimes referred to as spot, local or secondary ventilation. Intermittent ventilation is used to capture and remove pollutants quickly at the source. This secondary process exhaust “bad air” from contaminated areas quickly, before it can spread throughout the house.

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