Most of the windows in our rooms are mostly rectangular.
Why don't we chose any other shape like circle, triangle or trapezium? Does it affects airflow through room? Is the reason is that they look fancy or some specific reason?
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processing of long straight pieces of wood is an old industry called millwork.
It is very easy to cut and plane and finish long straight pieces of wood or metal and assemble them into rectangular windows and doors. It is a fortunate thing that evergreen pine and similar species that are used for machining into lumber grow tall and straight, so the millwork done using them tends to warp very little and stay stable over centuries. Most of the saws and finishing machines lend themselves to cut, extrude, long and straight continuous profiles.
This as opposed to round or arched window which is much harder to build and is very likely to warp after losing its moisture content and aging, has been one of the reasons.
Another advantage of using rectangular is because they easily fit into any structure with minimum adjustment. and lest we forget we use a plumb to build our walls perfectly vertical to fight the gravity
Another advantage is the property of the rectangular is to completely tile or cover a surface without leaving any left out areas, be it a house or a highrise or commercial building. It is a very basic way of standardization of windows in construction industry not much unlike standards for the doors, steps, pipe sizes,etc.
Even now that technology can produce wide selection of shaep, the rectangular is the most practical and elegant. Many of turn of century architectural monument established the beauty of using large continuous panels of glass in thin rectangular aluminum frames. frameless glass windows, work seamlessly together because they are rectangular.
And also as has mentioned in comments they are easier to pack and ship.
There are a few reasons on which rectangle comes at optima:
More popularity of rectangular shape means mass production and thus even lesser cost on top of the above advantages.