HVAC cladding Material

Which material is used for duct cladding?
Procedure of cladding?
Which is more favorable internal cladding or external?

Not required for ducting clading so already insulation available.
Ducting insulation material used for top side aluminum foil with with nitric rubber. 20 to 30 mm sufficient

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Polyurethane sheet is used for insulation of HVAC duct.

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Glass fibre wool is used in wfi and steam pipe line.

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