Plenum box

Plenum box A component forming an interface between ductwork and one or more air terminal devices. By virtue of its design or by the inclusion of accessories, it can also be used to equalize the pressure/velocity across air terminal devices. 

Primary airflow rate The mass or volume of air entering a supply air terminal device in unit time from an upstream duct or a plenum box. Or the air leaving through an opening and entering a space. 

Al. Big and boxy, unless you can afford time and money for a computer-designed and fabricated streamlined design that can assure uniform distribution to all burners at all firing rates. A big plenum box is ideal. 

Plenum There are two types of plenum, box or transltton type, for either forced draft ot indviced draft air cooler, see Figure 8. 

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See also in sourсe #XX -- [ ]

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