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Lined Duct |
- Round duct and fittings shown or specified as "lined" to be constructed of outer pressure shell fabricated from new, prime galvanized steel in accordance with the latest ASTM standards.
- Ductwork to be gauged per the latest edition of SMACNA's HVAC DUCT CONSTRUCTION STANDARDS for the specified pressure class.
- Duct and fittings to be internally lined with 1-inch "Spiracoustic" rigid duct liner, per manufacturers instructions.
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