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.
1 Damper-A metal door to close a flue when a fireplace is not in use. 2  Flue-The passageway in the chimney. 3  Hearth-The floor of a fireplace. 4  The part of a hearth which projects into a room may be called the front or outer hearth.