In general, the discriminant is an algebraic expression that gives. information about the roots of a polynomial. In the case of a quadratic equation the discriminant is the part of. the quadratic equation that is under the radical sign.
How to Select Dampers and Louvers. Dampers and louvers are used to control the flow of air in a process system or enclosed area. Dampers are usually motorized or manually-adjustable for flow control. Louvers are often fixed for a constant flow rate.
Greenheck dampers bring the same quality engineering and manufacturing that has earned Greenheck its. position as an industry leader. Aggressive research and development has made Greenheck the best choice in. the damper and louver industry. Greenheck has the most UL Classified dampers and the largest selection of. AMCA Licensed dampers and louvers in the industry.