This document discusses ventilation systems for poultry houses. There are two main types of ventilation systems - natural and mechanical. Mechanical systems include negative pressure, positive pressure, and combined/dual systems. Negative pressure systems are most common and use fans to expel air from the house, creating partial vacuum. They have different applications depending on weather - minimum ventilation for cold weather, tunnel ventilation for hot weather, and transitional ventilation for moderate weather. Positive pressure systems push air into the house. Combined systems use both exhaust and blower fans. Basic components of all systems include air inlets, controllers, cooling pads, sensors, and exhaust fans.

1. Ventilation
System
Presented by:
Theresa S K Mansaray
Alusine Bai Turay
Foday Serry

2. Ventilation

3. Conten
t:What is ventilation?
What are types of ventilation system?
What are components of ventilation
system?

4. Ventilation:
A system that delivers fresh air
throughout the poultry house, and in
doing so, removes excess heat,
moisture, and undesirable gases that may
be present.

5. Ventilation

6. Types of Ventilation
System:
There are two types of
ventilation
• Natural Ventilation
• Mechanical Ventilation

7. Types of Mechanical Ventilation
System:
Negative pressure
system
Positive pressure
system
Combined or Dual
system

8. 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

9. Negative Pressure

10. 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)

11. 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

12. Minimum

13. 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

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

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

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