proprietary devices that are listed
firestop components.
Requirements
Sleeves must be sized such as to adequately allow the passage of the intended
penetrant(s) plus enough room to permit the practical installation and mounting of the penetrants as well as adequate room for firestops. A general practice is to size the sleeve two NPS (pipe sizes) up from the
diameter of the penetrant. For example, a 4" pipe, with 1" of
thermal insulation makes a 6" penetrant (1" pipe covering on each side of the pipe), plus two pipe sizes = an 8" sleeve, creating a 1"
annulus.
In case of insulated piping, the size of the insulation must be taken into account for the intended firestop
certification listing.
Hazards
Metallic sleeves are
heatsinks in the firestop that follows the mounting of the penetrants. Maximum and minimum tolerances for wall thicknesses must be taken into account prior to casting. Heatsinks can affect
T-ratings.
Organicsealants used for topcaulking in firestops may let go of the sleeve if it has conducted too much
heat through to the unexposed side (as in the case of the
fire test article,
this picture).
Plastic sleeves are usually removed after the concrete forms are stripped, as they contribute fuel to an accidental
fire.