Class / Patent application number | Description | Number of patent applications / Date published |
454259000 | Including backdraft preventer | 7 |
20090023378 | FAN DAMPER - A damper assembly for use with an axial fan to prevent air from entering the discharge side of the fan when the fan is at idle. The damper assembly includes a damper door having multiple sections. The sections are able to pivot independently in response to the air flow created by the fan to minimize airflow resistance when the fan is operating. | 01-22-2009 |
20090029641 | Ventilation member and vented housing using the same - A ventilation member is provided that can ensure a long time until fogging is produced in the housing | 01-29-2009 |
20110028080 | Back draft damper - A back draft damper includes a rectangular shell having a central opening which air can pass through. A plurality of vanes rotatably mounted in the shell are rotatable between open positions where air can pass through the shell and closed positions where air cannot pass through the shell. The axes the vanes rotate about are slightly offset from vertical. | 02-03-2011 |
20110028081 | BACK DRAFT DAMPER - A damper is provided. The damper includes a frame having a central opening through which air passes. A plurality of vanes are rotatably mounted within the frame. At least one of the vanes is oriented about a rotational axis that is offset at a non-orthogonal angle with respect to one of a horizontal and vertical axis. | 02-03-2011 |
20130072103 | BACK DRAFT DAMPER - A damper is provided. The damper includes a frame having a central opening through which air passes. A plurality of vanes are rotatably mounted within the frame. At least one of the vanes is oriented about a rotational axis that is offset at a non-orthogonal angle with respect to one of a horizontal and vertical axis. | 03-21-2013 |
20140273800 | FAN ARRAY BACKFLOW PREVENTER - A backflow preventer for use in a multiple fan array system that draws air from an inlet area and expels it into a discharge area includes a main body defining an open front end and an open rear end and is adapted for attachment to a fan of the fan array system adjacent an inlet of the fan. Doors are attached to the main body and configured for movement between an open position in which air is permitted to enter through the open front end and a closed position in which the doors block the open front end and air is prevented from entering through the open front end. The doors are movable between the open position and the closed position by a pressure differential between the inlet area and the discharge area. The doors in the open position form a tapered intake passageway that funnels air into the fan. | 09-18-2014 |
20150369513 | Check Valve for Ventilation System - An air inlet valve including a housing with an opening, a cover plate and a centered rod for connecting the cover plate to the housing, wherein the air inlet valve furthermore includes a check valve plate made from a flexible sheet material and in which is provided at least one slot, extending from an outer perimeter of the check valve plate and towards center, and a central opening suitable for holding the check valve plate firmly on the centered rod, such that the check valve plate can be held firmly on the rod between the opening in the housing and the cover plate when the air inlet valve is assembled. | 12-24-2015 |