The American marine 250 Series framing with mitered corners utilizes an integral hinge that locks securely into the main frame. This system allows for easy removal of the vent frame for inspection, cleaning, or resealing. The maximum opening angle of the vent is approximately 50 degrees from the closed position.
However we can make them open up to 90 deg. with just changing the hinge system.
In the American 250 Series framing with radioed corners, external aluminum butt hinges are mechanically fastened to both the main frame and the vent frame. A non-corrosive delrin pin is used to connect the hinge sections. This system allows an approximate opening angle of 90 degrees from closure.
Dual telescoping adjuster arms with ratchet-action lock handles control and support the vent in the open position. Aluminum dogs firmly seat the vent into the outer frame in the closed position. Provisions for electric actuator motors are also available. A variety of frame finishes are offered. 3/16″ up to 1/2″ glass can be specified.