I would think that the opening for awning windows would be to a certain angle.
Awning window opening angle.
Increased insulation since these windows are made from just a single glass pane they provide a high insulation level unlike single hung or double hung windows that have several joints which allow air to pass through.
With a 90 degrees opening angle awning windows can be easily cleaned from both inside and outside.
Awning windows are hinged on top and open outward enabling ventilation without letting in rain or falling leaves.
There are plenty of options for securing an awning window.
Forty five degrees is the best angle for awnings.
Opening inward and up this window is ideal for basement window egress.
However awning windows are hinged at the top and are only available in one two or three lite configurations.
The hinges are mounted at the top and the window sash swings open to a 90 degree angle to the wall.
If you have a small window then the winding chain would be a shorter length compared to a larger window but the angle of opening might be the same iykwim.
Casement windows are hinged at the side and open outward to the left or to the right.
When framing a new window rough opening the sill can be sloped by cutting the top of the cripple studs at an angle.
It is better to retain this angle for houses in all north temperate latitudes and to adjust the length of the awning making it the right length to block the sun in the summer and allow the sunlight to enter the house in the winter.
When taking this approach remember that even a 5 degree slope will cause a 2 6 sill to protrude past the other framing members which could cause the sheathing to bulge out.
Casement windows are made for openings in which the height is greater than the width.
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They are available in one two three four or five lite configurations.
Push out awning window old world style with simple operation simply pull the lock handle up and push the window out stainless steel hinges allow this window to open up to 60.
The screen of this window is on the exterior.
This allows for lots of ventilation and an emergency escape providing the opening is large enough.
Awning windows are often used for basements because they can be placed high on the wall and easily operate with a turn of the handle.