Ventless Ventilation Hood. You will never need a built-in hood system again with this ventless hood. It alleviates smoke in your commercial kitchen and gives you the option to use other manufacturers electric products underneath like deep fat fryers, convection ovens, griddle cooking surfaces, range top cooking surfaces and steamers. These portable ventilation hoods give you the opportunity to set up shop just about anywhere from malls, stadiums, high-rise buildings to basements kitchens and kiosks. The interlocking system will not allow appliances to be energized if any of the filters are not in place. This airflow sensing system continually monitors airflow through the filtration system, optimizing performance and grease removal.