I am specifically looking for a mechanical door opener that, in effect, works the opposite way of a door closer.
So when the door lock is released the door will gently spring open.
I have a requirement to link a smoke shaft door into an addressable alarm system. I saw a system in an old building in Belgium whereby the smoke shaft door was held shut with a mag lock and upon activation the lock released and the door was literally pulled open by the device I am looking for, a sprung door opener rather than a typical door closer.
