circular

Δp: up to 1,500 Pa

Ø 100 – 400 mm

Casing air leakage flow rate complies with DIN EN 1751, class A
Control damper closed blade leakage complies with DIN EN 1751, class 4 (nominal size 100 and 125, class 3)

circular

Δp: up to 1,500 Pa

Ø 125 – 315 mm

Casing air leakage flow rate complies with DIN EN 1751, class A
Control damper closed blade leakage complies with DIN EN 1751, class 4 or 3

circular

Δp: up to 1,000 Pa

Ø 80 – 250 mm

Casing air leakage flow rate complies with EN 1751, class B