We did consider a heat recovery ventilation system, a box and pipes that bring in fresh air.

我们的确曾经考虑过热回收通风系统，用一个机箱和一些管道引入新鲜空气。

youdao

Presents general principles and forms for the design and selection of air-conditioning and ventilation system, involving kitchen air extraction and spot fresh air supply systems.

阐述了宾馆酒店厨房通风空调设计的一般原则及通风系统的采用形式，包括排风系统、岗位新风的设计。

youdao

The supply of fresh air in the existing air conditioning and ventilation system directly affects the working environment.

现有建筑物中央空调通风系统的新风供应情况，直接关系到人们的生活工作环境。

youdao

Ventilation can involve either 100 percent fresh air in which outside air enters and leaves the cabin in a single pass or a system in which various fractions of air are recirculated from the aircraft cabin and mixed with fresh air.

CNN: Commentary: Flu and your health on a plane