Use duct tape or masking tape to any weeping seams, holes or porous parts. This will halt any Gas Tank Sealer from oozing out, and will allow it to bridge in excess of the outlet. Plug the outlet ports with putty or Play-Doh. The amount of fire rated duct insulation https://fire-resistant-ductworth45566.idblogz.com/36851924/facts-about-caswell-group-revealed