Manual Operation

No actuation method. Due to our “opposing wing design” AMD still sells a large quantity of mine doors that are opened and closed manually. This can be done due to our design; the door actually uses the air pressure in the mine to assist with opening and closing the door. If an AMD doors wings are opened up 50%, the doors will remain in this position and not slam open or closed from the air pressure. This “balanced” design is the safest door design in the world.

American Mine Door