sink (in air pollution)

[ISO 16814:2008, 3.38]:object on which contaminants are deposited and remain, either permanently or temporarily.NOTE Sinks can become sources when they release deposited contaminants.

Continue reading →

size designation of a fan

[EN 12792-2003, 330]:size designation of a fan is the nominal impeller tip diameter, which is defined as the impeller tip diameter on which the design of the fan is based.

Continue reading →

sleeping unit

[ASHRAE Standard 62.1]:a room or space in which people sleep that includes permanent provisions for living, eating, and either sanitation or kitchen facilities but not both. Such rooms and spaces that are also part of a dwelling unit are not Continue reading →

slip joint

[EN 12792-2003, 332]:normally used on small rectangular ducts to join one component to another. The joint normally comprises of a female end on one component into which the male end of the adjacent component is inserted. Slip joints can also Continue reading →