Constant flow damper lindab | dampers and measure units VRL1 Dimensions Ød 1 l Description Constant flow damper with manual setting of one flow. VRL1 is a constant flow damper, which facilitates balancing of ventilation systems and gives correct flow from the start. The unit compensates for e.g. connection and disconnec- tionof system parts, clogging of filters and ducts, thermal lift forces, wind effects, window opening etc. Ø 80–250 fullfills pressure class A in closed position. Ordering example Product Dimension Ød 1 VRL1 125 Ød 1 nom 80 100 125 160 200 250 l [mm] 100 125 150 160 200 250 Tightness class across closed blade 0 0 0 0 0 0 m [kg] 0,08 0,14 0,19 0,36 0,54 0,81 Technical data Summary • VRL1 - manual single flow unit • Diameters Ø 80–250 • Flow range 4–295 l/s (13–1060 m³/h) • Pressure range 30–300 Pa (over the unit) • Independent of mounting direction Function The constant flow damper is an automatic damper, which at varying pressures wholly mechanical and independent of external energy sources maintains a set flow constant. The force, needed for regulation, is taken from the passing air stream. The air stream across the blade attempts to close it and generates a closing torque. This is balanced by an opposed opening force from a spring. The greater the pres- sure across the blade the more it closes. A bellow eliminates oscillations, which could occur at unfavourable conditions of operation. Temperature Working range: +10 to +50 °C. Material Housing and damper blade are made of a special antistatic and microbial resistant plastic. The smooth surfaces of the air-conducting components results in that the flow regulator thus meet the most stringent hygiene requirements. Lindab reserves the right to make changes without prior notice 1 2020-09-10
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