Question

The air supplied to the conditioned space is made free from all foreign matters such as dirt, fumes, smoke and harmful bacteria by ..............

• A. Filter
• B. Grill
• C. Register
• D. Fan

Hint:

Filters = clean air — grills and registers = direct air only!

Answer 1

The Correct Option is A

In air conditioning systems, it is very important to supply clean air to the conditioned space.
This is done by passing the air through an air filter.
Filters trap dust, dirt, fumes, smoke particles and harmful bacteria, improving indoor air quality.
They are installed in air handling units or ductwork and cleaned or replaced regularly.
A grill is simply a cover for air openings and does not filter air.
A register is an air outlet with a damper, used to control airflow but not for cleaning air.
A fan circulates air but does not remove contaminants.
Therefore, the filter is the correct device for cleaning air.