The task of these systems is to reduce heat, change relative humidity and bring fresh air to the greenhouse.

Types of ventilation systems:

A- Installation of ventilation niches:

One of the simple methods of ventilation is the use of ventilation in the side and roof of greenhouses.

 

These valves may be opened and closed with simple hand tools such as ropes, long springs, counterweights or handles and levers, or by gears placed on the entire axis along the roof. The axis of the gears may be forced to move with an electric motor or in some cases the driver chain is the rotation factor of the axis.

In modern greenhouses, electric motors and gears automatically control the opening and closing of valves.

 

B- Permeable tours:

This system is composed of permeable nets, boxes or double-head pipes, thermostats, electric motors and a small propeller.

Gratings are usually made of plastic or aluminum insulated by materials, a thermostat is located among the gratings that instructs electric motors to open and close the control niches.

Gratings are placed inside boxes or double-head pipes for more sensitivity of the grating, a small butterfly regularly sucks a stream of air into the box or tube, the airflow causes the system to react to the least changes in temperature.

 


C- Ventilation by fan:

This system is used in greenhouses where ventilation cannot be installed or anywhere else where natural ventilation is insufficient.

This system is composed of two large fans up to 1 m in diameter but with low circngths that are installed on both sides of the longitudinal greenhouse, located in the outlet of the shutter window balloon, which opens with the wind blower on. The fan is installed in a direction that brings air out of the greenhouse or plastic. Fresh air enters the greenhouse by hinged windows. These windows are usually automatically controlled with gear-like systems.


Service and maintenance of conditioners:

Keep the cool air entering ducts leading to the electric motors clean to be dust-free.
Weep and lubrise the gears, flat gears and chains that open and close the hatches.
Check the gearboxes and lubricile.
Use experts in case of system failure.