Mechanical joint sealant – FloAire Non-Welded Grease Duct Systems User Manual
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MECHANICAL
Joint Sealant
The joint sealant used to seal all joint assemblies is a 3M product. 3M Fire Barrier 2000 + Silicone
Sealant is a ready-to-use, gun-grade, one-component silicone elastomer that cures upon exposure to
atmospheric humidity to form a flexible seal. 3M Fire Barrier 2000 + Silicone Sealant, when installed
properly, will control the spread of fire before, during and after exposure to open flames. It will stop the
spread of noxious gas, smoke and water and maintain the integrity of fire rated assemblies and
construction.
NO SEALANT SUBSTITUTES MAY BE USED.
Sealant Features
1. Superior adhesion.
2. Capable of withstanding 2000 °F + temperatures.
3. Class 25 sealant, per ASTM 920.
4. Re-enterable/repairable.
5. Provides up to 4-hours fire-rating.
6. Cures upon exposure to atmospheric humidity.
7. Working time 30 minutes.
8. Cure time 14 to 21 days.
9. Applied with a standard caulk gun.
Table 1 – Sealant Usage Chart
3M FIRE BARRIER 2000 PLUS USAGE
DIAMETER
DUCT PERIMETER FT
AVERAGE FEET
PER TUBE
NUMBER OF
JOINTS PER TUBE
8"
2.16
30
7
10"
2.68
30
6
12"
3.21
30
5
14"
3.73
30
4
16"
4.25
30
3.5
18"
4.78
30
3
20"
5.30
30
3
24"
6.35
30
2.5