This question was posed to me in an interview for job.
My question comes from Building Bye-Laws topic in portion Planning of Building and Colony of Civil Engineering Drawing
Explanation: Hence, the min area for opening shall be not less than, i) 1/10th of the floor area for dry hot climate. ii) 1/6th of the floor area for wet hot climate. iii) 1/8th of the floor area for intermediate climate. iv) 1/12th of the floor area for cold climate.