state gov TSPSC Group 2 (తెలంగాణ గ్రూప్ 2) Mock Test Series General Science Physics Heat and Transfer
Ventilators are provided at the top of the room
1
to bring oxygen for breathing.
2
so that sunlight may enter the room.
3
to maintain convectional currents to keep the air fresh in the room.
4
to provide an outlet for carbon dioxide.