UL

Quick sizing tables provide a good overview of the volume flow rates with an airflow velocity of 2.5 m/s. Intermediate values can be interpolated.

Sizing example

Given data

V =2000 l/s (7200 m³/h)

v = 2.5 m/s

Fresh air

Maximum width: 1000 mm

Quick sizing

UL-2/1000×815

Calculation procedure

A = 1.000 × 0.815 = 0.815 m²

v = V ∕ A = 2000 ∕ 0.815 ( ∕ 1000) = 2.5 m/s

Δp_t = 30 Pa

UL, KUL: Width 200 – 600 mm, volume flow rate at 2.5 m/s

UL, KUL: Width 800 – 1600 mm, volume flow rate at 2.5 m/s

Differential pressure

Rectangular non-return dampers to prevent air from flowing against the intended airflow direction; for installation into internal walls and into rectangular ducts.

Ready-to-install component which consists of a border, blades with low-friction bearings, and travel stop and sealing parts.

Special characteristics

• Any intermediate sizes within the standard size range are available
• operating temperature: –20 – 80 °C
• Maximum differential pressure: 100 Pa
• Non-return dampers are opened and closed by the airflow; no actuator is required
• Non-return damper with formed aluminium blades for normal requirements; blades are fitted with seals for sound attenuation

Materials and surfaces

• Border, mullion and travel stop (angle section) made of galvanised sheet steel
• Blades made of formed aluminium
• Blade shafts made of brass
• Side bar made of PVC plastic
• Blade tip seals made of foamed polyester
• Blade restrictors made of plastic
• P1: Powder-coated, RAL CLASSIC colour
• PS: Powder-coated, DB colour

Technical data

• Nominal sizes: 200 × 215 to 1600 × 1615 mm
• Volume flow rate range: 110 – 6460 l/s or 396 – 23256 m³/h at 2.5 m/s
• Total differential pressure: 25 Pa at 2.5 m/s
• Maximum differential pressure in closing direction: 100 Pa
• Operating temperature: –20 to 80 °C

Sizing data

• V __________________ [m³/h]
• Δp_st __________________ [Pa]

Air-regenerated noise

• L_WA __________________ [dB(A)]

Type Installation subframe

Nomenclature

L_WA [dB(A)]

A-weighted sound power level of air-regenerated noise for the mechanically self-powered damper

A [m²]

Upstream cross section

v [m/s]

Airflow velocity based on the upstream cross section

V [m³/h] and [l/s]

Volume flow rate

Δp_st [Pa]

Static differential pressure

Δp_t [Pa]

Total differential pressure

All sound power levels are based on 1 pW.

Principal dimensions

B [mm]

Duct width

H [mm]

Duct height

n [ ]

Number of flange screw holes

m [kg]

Weight