The traditional exhaust hood and canopy hood with attached air curtain have different principles.

传统排风罩和气幕上吸罩是两种工作原理不同的局部排风设备。

youdao

Air passes through the inside of the range hood to be discharged, turbulent flow is not easy to generate in an exhaust pipe, noise is low, and the range hood only shocks slightly.

气流经过其内部流动直至排出，在排烟管内不易产生紊流，噪音小，油烟机不会产生大的震动。

youdao

They cooked 1, 200 pounds of french fries before okaying a commercial exhaust hood.

FORBES: By the Numbers

This time around the engineers put a 350hp Corvette V8 under the GTO hood and designed a new exhaust system that would closely match the throaty growl of the original.

FORBES: Global Motors