TROX type VFR dampers are used to adjust volume flow rates in air-conditioning and ventilation systems. They can be used in circular ventilation ducts with nominal sizes 80 to 250 and system pressures up to 1000 Pa.
The damper blade is designed without a seal and with a circumferential gap between the case and blade tip of approximately 3 mm.
For the flow rate balancing the lockable hand wheel is steplessly adjustable over a scale range of 0 to 10. For site set up the required set point as a function of pressure difference and flow rate is indicated on a diagram label affixed to the outside casing of each VFR.
At the minimum setting (closed position 0) a system pressure dependent leakage flow rate occurs. Hence for low leakage shut-off of ducts according to EN 1751 type AK shut-off dampers must be used. See leaflet no. 5/10/EN/...
Min/max changeover is possible with VFR dampers equipped with an electric actuator. Easy retrofit of an actuator is also possible.
| Downloads | Group | Type | Ident-No. | Type / Size |
|---|---|---|---|---|
| VFR | Balancing dampers | Technical Leaflet | 5/10.3/EN/2 | PDF / 256 KB |
