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排氣系統(tǒng)可以并入空調機組，也可以是單獨的遠程排氣系統(tǒng)。送風經過加熱或冷卻、加濕或除濕，然后排放到空間中。風門回風機回風排氣風門室外空氣混合空氣過濾器盤管送風機送風C2712圖15。使用回風的通風系統(tǒng)。圖14和15所示的通風系統(tǒng)應提供可接受的室內空氣質量，盡可能利用室外空氣進行冷卻（或補充冷卻），并保持適當的建筑增壓。有關通風的更多信息，請參閱本手冊的以下章節(jié)：-室內空氣質量基礎知識。-空氣處理系統(tǒng)控制應用-建筑氣流系統(tǒng)控制應用。過濾空氣過濾是中央空氣處理系統(tǒng)的重要組成部分，通常被視為通風系統(tǒng)的一部分。有兩種基本類型的過濾器可用：機械過濾器和靜電除塵過濾器（也稱為電子空氣濾清器）。機械過濾器分為標準過濾器和高效過濾器。
The exhaust-air system may be incorporated into the air conditioning unit, or it may be a separate remote exhaust. Supply air is heated or cooled, humidified or dehumidified, and discharged into the space. DAMPER RETURN FAN RETURN AIR EXHAUST AIR DAMPERS OUTDOOR AIR MIXED AIR FILTER COIL SUPPLY FAN SUPPLY AIR C2712 Fig. 15. Ventilation System Using Return Air. Ventilation systems as shown in Figures 14 and 15 should provide an acceptable indoor air quality, utilize outdoor air for cooling (or to supplement cooling) when possible, and maintain proper building pressurization. For more information on ventilation, refer to the following sections of this manual: — Indoor Air Quality Fundamentals. — Air Handling System Control Applications. — Building Airflow System Control Applications. FILTRATION Air filtration is an important part of the central air handling system and is usually considered part of the ventilation system. Two basic types of filters are available: mechanical filters and electrostatic precipitation filters (also called electronic air cleaners). Mechanical filters are subdivided into standard and high efficiency.
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