As temperature rises, the thermostat activates the burst timer. The window opens slightly, then waits before opening further, continuing until wide open.
As temperature rises, the thermostat activates the burst timer. The window opens slightly, then waits before opening further, continuing until wide open. As the temperature drops, the vent closes in one go. Both opening times and wait times are independently set. Supplied with Thermostat & Burst Timer pre-wired.