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Ventilation of the glasshouse structure is an essential function as a means for:
Avoiding excessive temperature build up resulting from solar gain during the summer months.
Creating air circulation to facilitate adequate gaseous exchange within the crop.
Purging the greenhouse of excessive humidity.
Mechanically operated ventilators creating natural convective air movement within the structure are the most common form of ventilation system at present in use in modern glasshouses. The ventilators are open and closed by electric motors. Modern day motors are compact, low on maintenance and, with integral limit switches and optional potentiometers, are ideally suited to automatic control.
The type of system employed depends largely upon the type of glasshouse. In general widespan glasshouses and garden centres use rack and pinion systems whereas Venlo houses employ rod and cable pulling systems.
David P Mitchell supply all the equipment required for the installation and maintenance of ventilation systems.
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