Patent ID: 7416481
Filing Date: 2008-08-26
Classification: F04D,F24F,H05K

Abstract:
1. A blower system, the system comprising: an invertible blower chassis having a blower intake fan having a rotational axis to draw air into the invertible blower chassis substantially along the rotational axis of the blower intake fan and having a blower exhaust substantially perpendicular to the blower intake fan rotational axis to direct an airflow from a side of the blower chassis at an airflow angle that is between an axis perpendicular to the chassis side and an axis parallel to the chassis side, the blower chassis being adapted to be used with both a first side and a second, opposite side being substantially perpendicular to a vertical axis aligned with a gravitational force, wherein the airflow angle is at an acute non-zero angle from the axis perpendicular to the chassis side and wherein further the airflow angle is substantially large such that the airflow angle is non-perpendicular to the chassis side; a backflow damper frame attached to the blower chassis and positioned to receive airflow from the blower chassis at the acute non-zero airflow angle; one or more damper vanes rotatably attached to the backflow damper frame, each damper vane having a vane body with a long axis, wherein the long axes of the one or more vane bodies are substantially parallel to the chassis vertical axis, and wherein the one or more damper vanes are adapted to freely rotate between a first, closed position and a second, open position; and wherein the one or more damper vanes block airflow into the blower exhaust when the one or more damper vanes are in the closed position, and wherein further the one or more damper vanes freely rotate to a position where the one or more vane bodies are substantially parallel to the airflow from the blower exhaust at the acute non-zero airflow angle.