| 摘要 |
<p>A ventilating hood has an ascending exhaust duct equipped with a series of air cleaning and purifying instrumentalities for removing grease, smoke and fumes generated by cooking equipment. Air rising through the duct passes successively through a grease extractor, an electrostatic precipitator, an activated charcoal filter and a deodorizing chemical spray. The grease extractor and precipitator are provided with hot water and detergent washing sprays. The hood has hollow walls containing air supply conduits for fresh air outlets which discharge streams of fresh air for sweeping into the exhaust duct smokey and grease-laden air from the cooking equipment. A control system provides an automatic wash and dry cycle for the grease extractor and precipitator and includes thermostatic control means for closing fire dampers and turning on the water sprays in case of fire in the ventilator.</p> |
