INDOOR AIR VENTILATION SYSTEM Russian patent published in 2012 - IPC F24F11/04 

FIELD: ventilation.

SUBSTANCE: indoor air ventilation system includes a shaft on the lower end of which the air flow control is installed and made in the form of housing 1 the wall 2 of which has perforated curved surface with a valve installed inside it in the form of flap 3. On upper part of the shaft there installed is two-bladed wind cock both plates 22 of the blades of which are located in vertical plane at straight angle to each other; one of them is hinged and kinematically connected by means of flexible tie rod 17, two-arm lever 9, spring 7 and balancing lever 4 with valve 3 flap. On the side of attachment to it of flexible tie rod the valve is spring-loaded to housing 1 of the control; at that, the spring attaching the lever to the control housing has the possibility of stiffness regulation.

EFFECT: reducing power consumption during winter period for ventilation of rooms equipped with natural air exhaust shafts.

1 dwg