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.
The damper is actually a flap inside the flue, which can be adjusted manually to allow smoke to escape or air to enter. The damper is often made of metal or ceramic so that it can tolerate the heat of the fire.