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.

2. Ventilation System
Presented to:
Dr. Shahid Mehmood
Presented by:
Suleman Arshad (2019-PS-005)

3. Ventilation System

4. Content:
What is ventilation?
What are types of ventilation system?
What are components of ventilation system?

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.

6. Ventilation System

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.

10. Negative Pressure System

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

13. Minimum ventilation

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

15. Tunnel Ventilation

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

17. Transitional Ventilation

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

19. Positive Pressure System

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

21. Combined Ventilation System

22. Basic Tools of Ventilation System:
 Air inlets
 Controller
 Cooling Pads
 Temperature sensors
 Static Pressure Sensors
 Exhaust Fans (Cone or Box fans)

25. Common Gas levels and Temperature Maintenance

26. Reference:
o Commercial Chicken Meat And Egg
Production (Fifth Edition)
o Ventilation System (Research Gate)