Zone Damper motorised air Vent PVC Duct Damper Ventilation Electric HVAC Damper Volume Control Volume Control Damper

works as expected, even the opening speed is not the greatest. It also has no sealing gasket where the flap sits(just a slight indent instead). I've paired it with an Arduino Nano to allow me to install it on a normal cooker hood vent replacing the flappy flap which used to make noise in strong wind. This one is sturdy and I've got no wind noise through ducting any more.

Installed as part of a ducted bathroom ventilation in a windy location. The normal backdraught shutter was banging like crazy in (the regular) high winds so needed a solution.Three things to note....1) this unit does not interface with UK standard air ducting so you will need some couplers and adhesive.2) the unit is power-to-open and power-to-close so in most cases you will need extra circuitry.3) the terminals block is not enclosed so you need to consider this from a safety pov.Electrically, I linked the switched live of the fan to a changeover (SPDT) relay and then switched the damper from the relay outputs. Worked a treat, the damper had end-of-travel switches so leaving control feeds live.Safety wise, I enclosed the damper such that needed tools to access.It isn't a no-hassle installation but powered dampers are generally excessively costly for a domestic installation given that most powered dampers seem aimed at fire safety.Having said this, in windy locations it is pretty much the only way to avoid excessive cold air backdraught or banging shutters.