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===FUNCTION===
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1. Take the advantage that wind can pursue
the direction of wind directly, the exit would trail wind forever.
Except wind would fill backward, and it would promote exhausting freely.
2. Take the advantage of the theory of hydrodynamics, the wind can
exhaust day and night, which improved the atmosphere in the room greatly.
3. It can avoid or decreasing the accidents like lack of oxygen or
gas poisoning, and create comfortable, safe, healthy environment.
It bears the great significance of preventing pop disease like SARS.
4. As to the warehouse, roofs of workshop, stock farm without fresh
air, our products would be very useful. It takes no electricity, without
noise. It is a new product which can save energy, protect the environment
and it also can decorate the ceiling.
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Electric scavenger fan is only
for urgent use It is better if fitted with air interchanger
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automatic swinging air interchanger
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VS
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electric scavenger fan
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| By using natural wind and without operation
cost, electric energy cost can be saved and put into investment.
It is a new product of energy-saving and environmental
protection. |
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| Electric energy is consumed and operation
cost is increased. Much electricity is consumed by the
storey of the building. |
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| Air is replaced automatically day and
night without manual operation. The accidents caused by
lack of oxygen or by carbon monoxide poisoning are reduced
or avoided and air in the room is kept clean. |
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| The fan cannot work all the day
or all the year. If it is switched off when the person
is out, air in the room cannot be kept clean, which will
easily result in the accidents caused by lack of oxygen
or by carbon monoxide poisoning. |
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| If strong wind occurs, the flow-backward
of air can be prevented so that waste air will get out
smoothly. |
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| If strong wind occurs, the flow-backward
of air will occur too so that waste air cannot get out. |
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| Only one air interchanger is necessary
for toiletrooms on several floors by the same ventilating
duct. It features little investing cost and good benefit. |
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| The fan shall be installed in every toiletroom;thus,
much cost is needed for investment. |
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| Material is used reasonably. With dependable
operation and long service life ,it is almost unnecessary
for maintenance. |
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| Trouble often occurs with power line
and electric notor, which may lead to accidents. Maintenance
is oftern the case. |
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| Almost no noise during operation. |
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| Some noise during operation disturbs
people's rest. |
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