Pressure relief door for air duct work
AssigneeA.J. Manufacturing Inc.
InventorTimothy Rogge
Life of this patent
Estimating the term…
Abstract
A pressure relief door system for use in a duct for relieving positive or negative pressure within the duct includes a frame to be mounted in the duct; a gasket in the frame; a hinged door mounted on the frame and sealing against the gasket; and an adjustable pressure relief mechanism normally holding the hinged door against the gasket and permitting the hinged door to open in response to a positive or negative pressure change. The frame and door can be mounted such that the door opens either outwardly from the duct in response to excess positive pressure or inwardly into the duct in response to excess negative pressure. The adjustable pressure relief mechanism may be magnetic.
Claims21
A pressure relief door system for use in a duct for relieving positive or negative pressure within the duct, the door system comprising:
- (a) a frame adapted to be mounted in the duct;
- (b) a gasket in the frame;
- (c) a hinged door mounted on the frame by a hinge and sealingly engaging the gasket;
- and
- (d) an adjustable pressure relief mechanism normally holding the hinged door against the gasket and permitting the hinged door to open in response to a pressure change;
- (e) wherein the pressure change can be positive or negative.
A pressure relief door system for use in a duct for relieving positive or negative pressure within the duct, the door system comprising:
- (a) a frame adapted to be mounted in the duct;
- (b) a gasket in the frame;
- (c) a hinged door mounted on the frame and sealingly engaging the gasket;
- and
- (d) an adjustable pressure relief mechanism normally holding the hinged door against the gasket and permitting the hinged door to open in response to a pressure change;
- (e) wherein the pressure change can be positive or negative;
- and
- (f) wherein the frame and hinged door can be mounted in the duct so that the hinged door can swing inwardly or outwardly.
A pressure relief door system for use in a duct for relieving positive or negative pressure within the duct, the door system comprising:
- (a) a frame adapted to be mounted in the duct;
- (b) a gasket in the frame;
- (c) a hinged door mounted on the frame and sealingly engaging the gasket;
- and
- (d) an adjustable pressure relief mechanism normally holding the hinged door against the gasket and permitting the hinged door to open in response to a pressure change;
- (e) wherein the pressure change can be positive or negative;
- (f) wherein the frame and hinged door can be mounted in the duct so that the hinged door can swing inwardly or outwardly;
- and
- (g) wherein the pressure relief mechanism further comprises a magnet mounted to the frame, the magnet attracting the door, and wherein the magnet can be moved toward and away from the door hinge, thereby providing decreased and increased opening pressure settings, respectively.
Dependencies are inferred from the claim text.