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.
Fire dampers are used in ducts to shut off air flow to prevent the spread of smoke or fire through the environment. A manual duct damper is a mechanical door the can be opened or closed by hand to control the amount of heated or cooled air entering an area.