Definition of Exponential Function. An Exponential Function is a function of the form y = abx, where both a and b are greater than 0 and b is not equal to 1. Exponential Decay. Exponential decay occurs when a quantity decreases by the same proportion r in each time period t.
A vent damper is an automatic devise that shuts off the flue pipe when the burner is not running. A vent damper has no effect on the running efficiency of the appliance. It only saves off-cycle losses of heated air. Therefore, if the appliance is in an unheated space, there is no benefit to a vent damper. A vent damper can achieve up to 10% annual fuel savings.
Some systems are ready-made for specific activities, like the one shown here for welding. Using portable fans or natural ventilation provided by open windows or doors may be easy, but these are often not enough to protect workers from breathing harmful contaminants. Mechanical ventilation systems that remove air are a better solution to reduce airborne contaminants to a level that is safe over a short or long period of time. There are 2 basic types of systems: Local exhaust ventilation (LEV) removes harmful contaminants at, or very near, their source. General industrial ventilation systems reduce the accumulation of less harmful contaminants in a room or entire building. These systems need to be designed and installed correctly to function effectively.