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To align with HTM 03-01 (Health Technical Memorandum) standards for healthcare ventilation, an Air Handling Unit (AHU) must follow a very specific sequence to ensure air quality, pressure gradients, and moisture control.

Gul Bahar Shah
  To align with HTM 03-01 (Health Technical Memorandum) standards for healthcare ventilation, an Air Handling Unit (AHU) must follow a very specific sequence to ensure air quality, pressure gradients, and moisture control. Here is a description of the components you would see in a "half-open" or sectional view of a medical-grade AHU, following the air path from the outside environment to the hospital space. 1. External Air Intake & Intake Shutter The journey begins at the Atmospheric Air Intake. Per HTM 03-01, this must be located away from pollution sources (like boiler flues or cooling towers). • Intake Shutter/Damper: An insulated, low-leakage damper that closes when the unit is off to prevent "stack effect" or freezing. 2. Primary Filtration (Pre-Filters) Before reaching any coils, the air passes through G4 or F7 grade filters. • Purpose: To protect the internal components from large dust particles and debris. • NHS Standard: These must be fitted with differ...
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Heating Ventilation And Air Conditioning System.

Gul Bahar Shah

 Heating Ventilation And Air Conditioning System.

Introduction
Heating ventilation and air conditioning system is also called as HVAC.
Heating ventilation and air conditioning systems play an important role in the air supply of any room, building or area.
Installation of HVAC in pharmaceutical industries is the requirement of cGMP and other legal agencies.
H of HVAC represents heating. Heating is done either by electric heaters or by the use of circulating hot water.
V of HVAC is for ventilation. Ventilation is the process of replacing the room air with fresh or processed air, removing odour, gases or microbes from a room or building.
AC of HVAC is for air conditioning, it provides cooling and maintains the humidity of the room or building.
Key Points to Discuss
In this topic, we will discuss the following,
Working Principle of HVAC
Functions of HVAC
Types of HVAC
Components of HVAC
In components of HVAC, we will learn about
Air Handling Unit or AHU
Ducts
Diffusers and Grills
In Air Handling Unit we will learn about all the parts of the air handling unit or AHU such as
Metal Housing
Mixing box or Mixing chamber
Filters
Cooling Coils
Heating Coils
Fan or blower
Dehumidifier
Humidifier
Working Principle of HVAC
HVAC usually works on the principle of purification and recirculation. Air from the environment is filtered, processed by heating or cooling and is supplied to the room or building through ducts called inlet ducts and this supplied air is removed from the area or room by the outlet ducts or return ducts. Some portion of this returned air usually 15-20% is exhausted in the environment and the remaining portion is again entered into the air handling unit for recirculation.
Some portion of the fresh air usually 15-20% enters into...

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