The annulus, or annular space, is the space between a penetrant and anything that surrounds it, such as the sides of an opening or a sleeve, depending on the case. It is named after the corresponding geometric concept due to its shape.
The annulus, or annular space, is the space between a penetrant and anything that surrounds it, such as the sides of an opening or a sleeve, depending on the case. It is named after the corresponding geometric concept due to its shape.
Source: Wikipedia "Annulus (firestop)" · CC BY-SA 4.0
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