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Environmental thickness of insulation for ductwork carrying warm air to control heat loss
Temperature difference between air inside ductwork and ambient air.	10掳颁
Thickness of phenolic insulation required by BS5422: 2001.	20 mm
Thickness of mineral fibre required by BS5422: 2001.	33 mm

Thickness of Insulation for Ductwork Carrying Chilled Air in Ambient Conditions To Control Condensation
Minimum air temperature inside duct.	15掳颁
Thickness of phenolic insulation required by BS5422: 2001.	15 mm
Thickness of mineral fibre required by BS5422: 2001.	25 mm

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