Hoolboom Wouter Bernardus Lambertus,Kurstjens Marcel Leonardus Hubertus
申请号：
US201515107329
公开号：
US2017049070(A1)
申请日:
2015.05.12
申请国别(地区):
美国
年份:
2017
代理人:
摘要：
A ventilation valve (1; 101) for ventilation of a space for keeping animals or plants includes an opening-defining circumferential framework (3; 103) for mounting in a wall of that space, and a movable panel (5; 105). The panel (5; 105) is movably attached to the circumferential framework (3; 103) to allow it to be moved relative thereto between a fully closed position, in which substantially no ventilating air can pass between the circumferential framework and the panel, and a fully open position in which substantially the complete opening is available for passage of ventilating air. Provided on the circumferential framework (3; 103) is a profiled edge which in a range between the fully closed position and a predetermined partly opened position provides a non-linear relation between a passage opening for the ventilating air and an associated relative movement position, or opening position, of the panel (5; 105) relative to the circumferential framework (3; 103). Also provided is a ventilation system for vent
