Consider the following statements
1. Forward swept blade impeller is used in draft fans.
2. Forward swept blade impeller is used in room air- conditioners.
3. Radial tipped blade impeller is used in draft fans.
4. Forward swept blade impeller is used in exhaust fans
Which of the statements given above is/are
Correct?
a. Only 1 b. Only 2 and 3
c. Only 4 d. 1, 2, 3 and 4