<p>A hood ventilation system of the present invention comprises a hood installed over a cooking source and having an intake opening at a surface of the hood opposed to the cooking source in order that air including cooking by-products generated from the cooking source can be sucked into the intake opening; a first air suction means installed in the hood and generating suction force for sucking air through the intake opening and exhausting air through an exhaust duct communicated with the first air suction means to the outside; and a second air suction means installed at the hood and generating suction force in order that air escaping from the intake opening can be introduced into the intake opening, whereby indoor environments can be comfortably maintained and air containing cooking by-products generated during cooking can be effectively exhausted to the outside.</p>
