Fancom B.v.

Marcel Leonardus Hubertus Kurstjens

Wouter Bernardus Lambertus Hoolboom

A ventilation valve () for ventilation of a space for keeping animals or plants includes an opening-defining circumferential framework () for mounting in a wall of that space, and a movable panel (). The panel () is movably attached to the framework () for relative movement between a fully closed position, in which substantially no air can pass between the framework and the panel, and a fully open position, in which substantially the complete opening is available for passage of air. A profiled edge on the framework provides a non-linear relation between a passage opening and an opening position of the panel (). Also provided is a system for ventilating the space, having at least a single ventilation valve, and for periodically determining parameters of inside air in the space, and adjusting the opening position of the valve based on the parameters.

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Panningen, Netherlands

Marcel Leonardus Hubertus Kurstjens