General Information
Application
- Pressure relief dampers for the protection of internal spaces from differential pressures higher than set maximum levels
- When the set maximum differential pressure is exceeded, the blades automatically open to relieve the excess pressure
- Pressure peaks will be reliably controlled
- The differential pressure can be adjusted from 0.2 – 4.02 in w.g. (B > 24 in: 2.41 in w.g. max.)
Special features
- Robust, maintenance-free construction
- Maximum differential pressure: 20.07 in w.g.
- Air leakage with back pressure, in closing direction, to EN 1751, class 4
- Damper for negative or positive pressure (air extract or discharge)
- Operating temperature 32 to 176 °F
- Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel
- Each blade is locked with a factory set permanent magnet
- Adjustable differential pressure for blade opening: 0.2 – 4.02 in w.g., depending on width
Nominal sizes
- B: 8, 16, 24, 32, 39, 47 in (intermediate sizes: 8 – 47 in, in increments of 0.04 in)
- H: 14, 27, 40, 53, 66, 79 in (intermediate sizes 14 – 20, 27 – 33, 40 – 46, 53 – 59, 66 – 72 in in increments of 0.04 in)
- Any combination of B × H
Construction
- Galvanised sheet steel, duct connection without flange holes
- A2: Stainless steel
- G: Duct connection with flange holes
Parts and characteristics
- Ready-to-install pressure relief damper
- Blades with low-friction bearings
- One retaining element with a permanent magnet for each blade
- Seal
- Travel stop (angle section)
Construction features
- Rectangular casing, material thickness 0.08 in
- Blades, material thickness 0.12 in
- Flanges on both sides, suitable for duct connection, with or without flange holes
- Adjustable retaining element to adapt to various pressures (factory set as ordered)
- Blades can be moved independent of complementary to one another
- Blades with perimeter seal, pressed against travel stop (angle section) when closed
- Blade shafts with maintenance-free plastic bearings
Materials and surfaces
- Casing and travel stop (angle section) made of galvanised sheet steel, material no. EN 10346-DX51D+Z140-200
- A2 construction: Casing and travel stop (angle section) made of stainless steel, material no. 1.4301
- Blades made of aluminium, material no. AlMg3
- Blade holders made of stainless steel, material no. 1.4301
- Blade shafts made of stainless steel, material no. 1.4104
- Plate of the retaining element made of steel, material no. 1.0718
- PPS bearings
- Neoprene seals
- P1: Powder-coated, RAL CLASSIC colour
- PS: Powder-coated, DB colour
Standards and guidelines
- Casing air leakage to EN 1751, class C
- Closed blade air leakage (against the intended airflow direction) to EN 1751, class 4
Maintenance
- Maintenance-free as construction and materials are not subject to wear
- Contamination should be removed as it may lead to corrosion and to increased closed blade air leakage
