Ventilation combination: Combining both exhausts and blown into the room, this is the effective method.
Ventilation exhausts and combination systems include exhaust fans blowing and blowing. So can actively suck air pollution generated in the location and level toxins into the required position largest fresh wind. This method has all the advantages of the two methods above, but eliminates the disadvantages of the two types of air supply that. However, the combined method has the disadvantage of higher investment costs.
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