Ventilation means indoor air circulation of the greenhouse by wind force and air displacement. On some spring and autumn days, and all summer days, indoor air efficiency can be extremely warm in the absence of proper ventilation, so plants growth and productivity will decline. Vacuum ventilations are now used in greenhouses or even poultry farms. In general, any fan should be able to extract greenhouse or poultry air every minute. A greenhouse fan or poultry fan is essentially an air pump which is a device that circulates air
Atlas Tajhiz Pardis Co manufactures 1/40 ventilation fans to regulate greenhouse air