Air Washer Unit

1. Overview

Air Washer Unit or Air Cooling Unit, is an air handling system designed to
supply filtered and conditioned (cooled or fresh) air to indoor spaces.

• Primary functions:
  • Provide fresh air for ventilation.
  • Reduce heat and control odors / fumes.
  • Maintain positive air pressure to prevent ingress of dust and
    pollutants.
  • Improve occupant comfort by lowering air temperature and
    increasing air quality.

These units are widely used in:

• Commercial kitchens: To supply fresh, filtered air and balance exhaust
  losses from kitchen hoods.
• Industrial & factory spaces: For cooling and ventilation in manufacturing environments.
  losses from kitchen hoods.
• Warehouses: To improve ventilation, maintain temperature, and control
  dust.
• Commercial applications: Shopping malls, event halls, large canteens,
  etc.

2. Construction Features:

A standard Air Washer / Fresh Air Unit is made up of the following components:

3. Working Principle:

• Fresh air is drawn from outside through the filters.
• Air passes through the cooling section:
  • In Air Washer (Evaporative Cooling): Water is sprayed over pads
    or media; air passes through them, absorbing moisture and
    reducing temperature by 5–12°C (depending on climate and
    humidity).
  • The blower delivers the conditioned air into the duct system for
    distribution.
• In kitchens, the unit balances exhaust air losses, preventing negative
  pressure.
• In factories/warehouses, it provides cooling and dilutes contaminants.