主权项 |
1. A ventilator adapted to be mounted to a wall of a building comprising:
an air intake hood adapted to be mounted to an exterior side of a building wall; a gang of individual air channels extending from said air intake, each said air channel having an exit end having a size for air flow in one direction from said air intake to said exit end; a gang of air control valves, allowing airflow only in the one direction each air control valve being mounted within one said individual air channel of said gang of individual air channels; and a plate having a gang of air accelerating air nozzles adapted to be mounted to an interior side of the wall opposite said air intake, each said air nozzle being positioned in close proximity to said exit end of one said individual air channel of said gang of individual air channels opposite said air intake and being positioned adjacent one said air control valve, each said air accelerating air nozzle having a size smaller than said air channel size, whereby the air accelerating air nozzles accelerate an airstream there through to restricts the formation of ice adjacent the nozzle. |