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Ductwork - Seal Classes

Ductwork air leakage classes.

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ASHRAE and SMACNA standards specify the duct sealing requirements in terms of seal classes A, B and C.

Seal Class A - All transverse joints and longitudinal seams and duct wall penetrations shall be sealed. Pressure sensitive tape shall not be used as primary sealant. Max. 2 to 5 percent total system leakage.
Seal Class B - All transverse joints and longitudinal seams shall be sealed. Pressure sensitive tape shall not be used as primary sealant. Max. 3 to 10 percent total system leakage.
Seal Class C - All transverse joints shall be sealed. Max. 5 to 20 percent total system leakage.
Unsealed - 10 to 40 percent total system leakage.

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Related Topics

Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

Air Duct Components - Minor Dynamic Loss Coefficients - Minor loss (pressure or head loss) coefficients for air duct components.
Air Ducts - Friction Loss Diagram - A major friction loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm.
Air Ducts - Major Friction Head Loss, Online Calculator - Head loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - Imperial and SI units.
Duct Velocity - Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator.
Ducts - Sheet Metal Gauges - Thickness of sheet metal used in ductwork.
Ductwork - Supports - Recommended distance between ductwork support hangers.
Equivalent Diameter - Rectangular vs. Circular HVAC Ducts - Rectangular equivalent diameter for air flows between 100 - 50000 cfm.
HVAC Ducts - Air Velocities - Recommended air velocities in HVAC ducts.
Noise generated in Air Ducts - Estimate noise generated by air flow in ducts.

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