To check if you qualify for a minimum of 10 square meters, simply add the area of each window/door and total it. If the total is greater than 10, you're good to go.
To calculate the area of your window/door;
- Note down the Width & Drop in milli meters (mm) and divide them by 1000 to have the Width and Drop in meters (m).
- Once you have the Width & Drop in meters (m), multiply them both to get the area in square meters (sqm).
- Now do that for each window & add them all to check if the total is over 10 square meters (sqm).