It points out that it is necessary to think of building environment for energy conservation of heating ventilation and air conditioning system.

本文针对暖通空调节能的趋势，分析了建筑环境对暖通空调系统的影响，提出从建筑环境方面考虑问题是暖通空调节能的必要途。

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Therefore, commissioning and maintaining ventilation and air conditioning system is an essential step during the construction and later maintenance.

因此，通风、空调系统的调试与维护是通风空调工程施工及后期维护中的必不可少的工序。

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They are widely used in the ventilation and air conditioning system in mining and construction. They are a new alternative environment friendly product.

广泛应用于矿山、建筑的通风和中央空调工程，是新型的环保替代产品。

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Rupert said the same chlorine dioxide treatment will be used on the building's heating, ventilation and air conditioning system (HVAC), where spores had been found after the letter was opened in Daschle's office.

CNN: Fumigation largely succeeding in clearing anthrax