return air

基本解释

Figure 5 shows the effectof different floor configurations on return air space.
图5展示了回流气体空间不同的地板结构的效果。
Then, after taping and painting, screw a “return air” grate over the opening to conceal it but still have access.
然后镶边、涂饰面，再然后在开口上安装“回风”把开口隐藏起来，但“回风”要是可以拆卸的，以便还能接触到内部的构件。
About 240 square inches(1548cm2) of return air passage are needed for the average trailer's refrigeration fan to operate at 100 percent capacity.
如果想让拖车内的制冷风扇100%地工作，那么，回流空气的量大概为240平方英寸（1548cm2）。

He also announced that two Turkish military air ambulances had been sent to Israel to help return the wounded.

UTC's solution: Pass the return air through an aluminum filter sprayed with titanium dioxide that, hit with ultraviolet rays, sets off a chemical reaction that breaks down nasty organic compounds like benzene and formaldehyde into carbon dioxide and water.
FORBES: Companies & Strategies
The panel recommended an alternative force structure that would return the Air Force and Navy to the size proposed by the BUR almost 20 years earlier.
CENTERFORSECURITYPOLICY: Center for Security Policy The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century