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.
damper - a movable iron plate that regulates the draft in a stove or chimney or furnace. 1  chimney - a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building. 2  plate - a sheet of metal or wood or glass or plastic.