You wanted round air duct liner that was easy to fabricate and quick to install. You got it from Johns Manville. The Spiracoustic Plus™ System fits round ducts of virtually any size.

The coated liner delivers enhanced indoor environmental quality and superior thermal and acoustical performance. Eliminating internal perforated metal means lower material and labor costs.

Best of all, for most shop or field applications the liner "snaps" into place and stays there. Superior performance and easy installation - that's success.

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