Pophen

Standard

Scope of Application 

Strength Classes and Leakage Rate Limits for Rectangular Cross-section Metal Air Ducts (Galvanized, Stainless Steel, Aluminum Ducts, etc.)

Core Technical Requirements 

Strength Class: Seal the air duct, apply the specified pressure (positive or negative), maintain for 60 seconds, and observe for cracking or excessive deformation.

 

Class

Positive Pressure (Pa)

Negative Pressure
(Pa)

Application Scenario

A

 

400 

-200 

Low-pressure Ventilation Systems

B

 

1000 

-500 

Medium-pressure Systems
(Industrial Factories)

C

 

2000 

-750 

High-pressure or Special Demand Systems

Special Class:
Class D is only for special equipment and needs to meet higher pressure or special environmental requirements.

-

-

-

 

Leakage Rate Limit: Measure the leakage per unit area using the air pressure method or flowmeter method. For specific steps, refer to Appendix A of EN 12237.

Class

Leakage Rate (L/s ·m²)

Application Scenario

L1

≤0.027

High-airtightness Systems(e.g. Hospitals,Laboratories)

L2

≤0.09

General Ventilation Systems

L3

≤0.27

Industrial Ventilation or Non-critical Areas

 

Remarks

‌General ventilation systems (e.g., office buildings, hotels): EN 12237-Class A or EN 1507-Class A is usually selected.

Smoke and fire control systems: EN 12237-Class C or EN 1507-Class C is mandatory to ensure structural stability during fires.

Industrial environments (e.g., chemical plants): Class B or C should be selected according to pressure requirements, paired with low leakage rates (L1/L2).

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