How to make Exhaust fan

To expel hot air out of the kitchen, ‘A’ has an exhaust fan fitted on the window of her kitchen and ‘B’ has a similar exhaust fan fitted on the wall near the ceiling of her kitchen. Which of the exhaust fan will expel the hot air more effectively? Explain why?

How can internal combustion engines be modified to make auto exhaust free from pollutants ?

A hand fan is made by stitching 10 equal size triangular strips of two different types of paper as shown below. The dimensions of equal strips are 25 cm, 25 cm and 14 cm. Find the total area of paper needed to make the hand fan.

On selling an exhaust fan for ₹ 7350. a man gains 1/6 of its cost price. Find the cost price of the fan.

Hofmann Exhaustive Methylation