Air vents are placed based on the required cfm load calculation per room not necessarily set at specific square feet apart. But you need to make sure that supply and return air are not close to each other. Supply air vents should be placed close to outside walls and return air close to interior central walls.
in the floor.
The area of Treize-Vents is 19.12 square kilometers.
The area of Sept-Vents is 12.52 square kilometers.
There were no "vents" involved.
Don't know what vehicle you have but, sounds like the duct work came apart for the middle vents.
The area of Villers-aux-Vents is 6,140,000.0 square meters.
The area of Danne-et-Quatre-Vents is 7,200,000.0 square meters.
Smoke detectors should be placed at least one in every bedroom, outside each sleeping area, and on every level of the home, including the basement. They should be placed on the ceiling or high on the wall, away from windows and vents. Follow the manufacturer's guidelines for specific placement recommendations.
NO.
should be on floor.
Vents should be situated near windows. Windows that are north or west facing should get a vent before a south or east facing window would get one. (Assuming that the vents also supply heat.)
No, but they all should have.