Definition of plenum ventilation : a system of ventilation that applies the motive force at the inlets, drives the air through the rooms which become plenums, and avoids the incoming of cold drafts.
What is plenum in mechanical?
plenum – an enclosed space in which the air pressure is higher than outside. enclosure – a structure consisting of an area that has been enclosed for some purpose.
What is the plenum in HVAC?
Plenum boxes are usually situated on either side of the fan or heat exchanger and have the important function of bringing in, distributing, and removing air. They are the air’s first stop after being heated or cooled and its last stop before going back into your AC, heat pump, or furnace.
What are three types of mechanical ventilation systems?
There are three types of whole-house mechanical ventilation systems: exhaust-only, supply-only, and balanced. Each system uses a combination of fans, ducting, dampers and controls, and they each have different pros, cons, and costs accompanying them.
What is a plenum used for?
In building construction Plenum is a separate space provided for air circulation for heating, ventilation, and air-conditioning. It is commonly found in the space between the structural ceiling and a drop-down ceiling or under a raised floor.
What is plenum engineering?
[′plen·əm] (engineering) A condition in which air pressure within an enclosed space is greater than that in the outside atmosphere.
Where is plenum required?
Plenum rated cable has a special insulation that has smoke and low flame characteristics. It is mandated to be installed in any “air handling” space. For instance, most large office buildings use the ceiling to return air to the AC unit.
What is inside the plenum?
The plenum within this form of heating and AC unit is an air distribution box. It is directly connected to the supply outlet. On top of passing through a filter to remove dirt, dust, and other contaminants, the air pushed through the ducts must go through the supply plenum.
How does a plenum ceiling work?
Plenum ceilings use the area between the dropped ceiling and the floor slab above as a return air path, but when these dropped ceilings are removed, the plenum area is reduced and can restrict the flow of return air.
What is the purpose of plenum?
What is a plenum in a HVAC system?
A plenum is an air-distribution box attached directly to the supply outlet of the HVAC equipment that heats or cools the air to make the house comfortable. The ductwork that distributes the heated or cooled air to individual rooms of the house connects to the plenum.
What is a plenum on a furnace?
An HVAC plenum is a thin box with five sides made of galvanized sheet metal. It connects to the outlet of a furnace or air handler and is a key component of any HVAC system.
What is a plenum duct?
The plenum is the section of duct immediately beyond the furnace or air handler. It is typically the same width and depth as the discharge opening of the furnace or air handler, and extends approximately two and a half to three feet.
What is a heater plenum?
A plenum heater is an electric resistance heating device that is installed in the plenum, which is the spot in the ductwork system where ducting and furnace join.
