negative rated operating pressure
[EN 12792:2003, 265]:tested maximum negative pressure at which a duct is rated.
Continue reading →Glossary Terms
net occupiable area
[ASHRAE Standard 62.1]:the floor area of an occupiable space defined by the inside surfaces of its walls but excluding shafts, column enclosures, and other permanently enclosed, inaccessible, and unoccupiable areas. Obstructions in the space, such as furnishings, display or storage … Continue reading →
network technique
[AIVC, Air infiltration and ventilation glossary, 1992]:theoretical method for estimating the magnitude of air infiltration ventilation and interzonal air movement using a model which considers a building to comprise a number of enclosed spaces each at its own internal pressure … Continue reading →
neutral pressure level
[AIVC, Air infiltration and ventilation glossary, 1992]:level at which the air pressure difference, derived from the stack effect between inside and outside a building is zero.
Continue reading →nominal length of a flexible duct
[EN 12792:2003, 266]:is the actual length of a flexible duct after decompression and in an unstressed state.
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