Low Leak Dampers Block Moisture While Allowing Heating, Ventilation and Air Conditioning Regulation
Low leak dampers are available in a variety of choices and designs. Most dampers are by nature low leak dampers. However certain systems do have benefits over others. Low leak dampers can apply to low leak moisture dampers, low leak smoke dampers, automatic zone dampers and several other models.
Moisture can be detrimental to any HVAC ventilation system. Moisture in components and other foreign materials can greatly shorten the longevity of a damper. Foreign materials can cause the damper to wear out rapidly and not function properly.
If a damper is said to be naturally open that means the blades inside the damper remain in the open position and allow air flow if the control damper actuator loses power. However this is not ideal for applications that involve moisture concerns. These type of open dampers are best suited for internal duct work applications where moisture is not present.
If a damper is naturally closed the blades of the damper automatically seal when the damper control actuator loses power. This is best suited for applications where moisture is a primary concern. This insures if the damper actuator loses power in events such as in severe weather the damper blades will automatically close.
Specific types of low leak dampers include the guillotine damper and the fire damper. The guillotine damper is a type of slide gate damper. The damper is used for situations which require complete air isolation. A guillotine damper is used in manufacturing plants for air control when maintenance is required. The damper is not intended for flow modulation.
Smoke dampers are also available as low leaks dampers. Low leak smoke dampers detect the presence of smoke in ventilation duct work. They are a means of passive fire protection and have automated functions. They are often tied into a control panel which signals specific actions in the ventilation duct work. Commonly an air test is used to determine if a room is sealed in case of a fire by means of damper control.
Smoke dampers are also used in combination with fire dampers which are another type of low leak dampers. Fire dampers are set to shut at predetermined temperature (approximately 165 degrees Fahrenheit). A fire damper has to have a flame resistance equal to at least 75 percent of the flame resistance rating of the fire wall that it is installed in.
Dampers need to have a low leak rate because introduction of foreign materials like water in your duct system can be harmful to your heating, ventilation, and air conditioning system. Dampers can also be used in combination with louvers for extra protection of foreign objects while maintaining air flow regulation. Air flow regulation is important in situations where extreme weather conditions are present. There are hurricane louvers that can withstand extreme rain and cover external dampers such as those located on the roof.
Low leak dampers are an important component of any heating, ventilation, and air conditioning system.