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
A sleeve (, a word allied to '' slip'', cf. Dutch ) is the part of a garment that covers the arm, or through which the arm passes or slips.
The sleeve is a characteristic of fashion seen in almost every country and time period, across a myri ...
, depending on the case.
It is named after the corresponding
geometric concept due to its shape.
References
External links
External examples of the use of the term.
Annulus, a term used within a firestop patentAnnulus, as used in UL System C-AJ-1557 Firestop System, Configuration A
{{Fire protection, state=collapsed
Passive fire protection
Firestops