Listings
with 3-M, Hilti, Rectorseal and Nelsons all require a minimum of 1 inch of mineral wool batt insulation, packed tightly, into both ends of the
sleeve and recessed for the amount of sealant to be used. The wool batt acts as a
backing for the intumescent sealant that is used to seal both ends of the sleeve. Mineral
wool batt insulation is a common fireproof material used to insulate hot water heaters,
fireplace inserts, and heating ducts. The best source for this packing material are the
local commercial insulators in your area. Most of our distributors stock it as well. Note
that some old-timers may call it rock wool.
Our vertical and 4 hr.
Systems do require this packing. |
All of our
sleeve systems require the use of an intumescent caulk or putty
to seal both ends of the sleeve. This material expands in the presence of heat / flame,
suppressing the spread of a fire through the sleeve system penetration. The
way a sleeve is packed and sealed are directly proportional to the amount of time a system will suppress
a fire. For example, a 1 inch thickness of intumescent putty may be sufficient
for a 1 or 2 hour rated penetration but a 3 or 4 hour application might require a 2 (or
more) inch thickness in the ends of a sleeve system. Several fill material manufacturers
have developed, tested, or engineered through penetration systems combining our sleeves
and their fill material. All of our
systems now have our intumescent putty included with the sleeve. |
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