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Technical details can be found here

Tune-R-3 is control damper for round ducts. It has blade tightness class 4 and casing tightness class C tested according to EN 1751. Ideal for duct installation with air tight requirements towards the outside of the duct or to minimize the leakage towards outside surroundings (for example hospital patient rooms, industry applications, etc). Since the blade is also air tight the duct can be fully closed. The damper special construction allows external insulation up to 50 mm. The damper can be supplied in manual or motorized version with integrated position indicator. Maximum allowed temperature is 100°C. Maximum duct pressure is 1000 Pa.


The damper is manufactured from galvanized steel sheet and is silicone free. All gaskets are manufactured from black rubber. Plastic bushings are from PPO material. All materials are flame retardant. It is available from dimensions 80-630 mm. This version is supplied with Belimo 230V rotary actuator.


Ordering codes



Tightness class versions 

1 - Casing tightness class A & blade tightness class 1 (no rubber gasket on inlet and no rubber gasket on blade)

2 - Casing tightness class C & blade tightness class 1 (rubber gasket on inlet and no rubber gasket on blade)
*3 - Casing tightness class C & blade tightness class 4 (rubber gasket on inlet and rubber gasket on blade)


Actuator versions

H - handle (hand operated)

M0 - preparation for actuator

M1 - 230V rotary actuator

* M2 - 24V rotary actuator

M3 - 24V, 0-10V operated actuator

M4 - 230V spring return actuator

M5 - 24V spring return actuator

M6 - 24V, 0-10V spring return actuator


* current version


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