Noah was also instructed to make a “window” for the Ark. “A window shalt thou make to the ark, and in a cubit shalt thou finish it above” (Genesis 6:16). The Hebrew word translated “window” is tsôhar and it literally means a “light” or “double light” as in midday or noon. Only in this passage is it translated “window,” so evidently it was some way to allow outside light into the Ark.
Toward the end of the voyage we are told, “And it came to pass at the end of forty days, that Noah opened the window of the ark which he had made” (Genesis 8:6, emphasis mine). In this case, the Hebrew word is challôn and this word does mean “window” and is so translated throughout the Old Testament.
This tells me that Noah had some leeway in the construction of the Ark and not every detail was strictly dictated by God. This fact gives me confidence in using my “sanctified imagination” in creating the detail for the model not specified in Scripture.
The roof, therefore, features an opening beneath the eave of the main roof extending the length of the Ark on both sides as well as the vent opening above the main roof. These two sets of “windows” would allow for air circulation and ventilation.