Adjustable flue control for furnaces

In a furnace flue damper construction, including a length of flue pipe, an orificed plate positioned transversely with respect to the principal axis of said pipe, and a butterfly type valve member pivotally mounted with respect to said orificed plate to selectively close an orifice therein, the improvement comprising:

• first, second and third weight elements mounted upon and pivoting with said valve member;
• said first weight member being mounted upon a first side of said valve member, and having means for adjustment laterally with respect to the plane of said valve member;
• said second weight member being mounted on a second side of said valve member and having means for adjustment in a plane parallel to the plane of said valve member;
• said third weight member including a bracket mounted upon said first side of said valve member, said bracket member rotatably mounting an elongated threaded member having a free end thereof having tool engaging means thereon, said flue pipe having an opening therein for access to said free end when said valve member is in predetermined position relative to said pipe, and weight means threadably engaged upon said threaded member for movement there along with rotation of said threaded member in a plane parallel to the plane of said valve member, said last mentioned weight being shiftable across the pivotal axis of said valve member.