This document summarizes different types of ventilation systems used in poultry houses. It discusses natural ventilation and mechanical ventilation systems. The main types of mechanical ventilation systems covered are negative pressure systems, positive pressure systems, and combined/dual systems. Negative pressure systems are most commonly used and have fans and inlets as main components. Different types of negative pressure systems for cold, hot, and transitional weather are described. The document also briefly discusses positive pressure systems and combined ventilation systems. Basic components of a ventilation system like inlets, controllers, cooling pads, sensors, and exhaust fans are listed.
5. Ventilation:
Asystem that delivers fresh air throughout the
poultry house, and in doing so, removes excess
heat, moisture, and undesirable gases that may
be present.
7. Types of Ventilation System:
There are two types of ventilation
• Natural Ventilation
• Mechanical Ventilation
8. Types of Mechanical Ventilation System:
Negative pressure system
Positive pressure system
Combined or Dual system
9. Negative Pressure System
This system
Is commonly used in poultry houses
Has basic two main components i.e. fans & inlets
Fans are arranged to expel air from poultry house
Hence they create partial vacuum inside the house
The partial vacuum or pressure difference pulls
fresh air through the inlets into the house.
11. Types of Negative Pressure System:
We divide the negative pressure system in different
weathers as:
1. Cold Weather Ventilation (Minimum Ventilation)
2. Hot Weather Ventilation (Tunnel Ventilation)
3. Optimum Weather Ventilation (Transitional
Ventilation)
12. Minimum ventilation:
Cold Weather Ventilation is
• Used to provide fresh air inside the house
• Removes excessive moisture and minimize heat loss
• Fans exhaust air to produce slight negative pressure
• Air inlets installed either in ceiling or high on side wall
• These inlets allowing air to mix with warmer air there
14. Tunnel Ventilation:
Hot Weather Ventilation
Is a negative pressure system
Exhaust fans are located at one side
Two large opening are installed in opposite side
Cooling pads & misting nozzles are also installed
It create high velocity airflow usually 500 ft or 122m/min
It is efficient method to reduce heat stress on birds
16. Transitional Ventilation:
Optimum Ventilation is
Fall and spring are transitional season
A difficult time for farmers to manage ventilation
Temperature difference of day and night ranges from 15 to
20 degree centigrade
Wind chill require at day time but may hurt bird performance
at night
Hence switching between minimum & tunnel depending
upon outside temperature
18. Positive Pressure System:
It basically uses fans to push air into the house
A number of system are used in poultry house
One system pushes warm air & mix it with inside air
Other system pump the air through ducts with outlet
It distributes heat and mix air in the house
20. Combined Ventilation System:
It uses two types of fans
Exhaust fans create the negative pressure in house
Blower fans outside the house to pump fresh cool air
It is used in summer & to distributive air in old house
Incoming air is drawn through evaporative coolers
instead of inlets