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- Water-based fiber-reinforced duct sealant/mastic formulated for indoor/outdoor use
- Meets U.L. Class 1 rating & local codes
- Features long term flexibility & strength
- Use on metal heating, ventilating, and A/C duct systems
- May be applied to fiberglass duct board systems and flex duct systems
- Recommended for use to 10" of water column pressure without the need for fiberglass mesh reinforcement
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