Proper ventilation is critical for vegetable greenhouse temperature management and air quality. Natural ventilation through side vents and roof openings creates convective air flow. Mechanical ventilation using exhaust fans provides forced air exchange. Ventilation rates should provide 4-6 air changes per hour during summer. Ridge vents along the roof peak allow hot air to escape naturally. Side vents provide fresh air intake. Proper vent placement prevents dead zones with poor air circulation. Automated controllers respond to temperature sensors. Evaporative cooling pads complement ventilation in hot climates. Adequate ventilation reduces humidity that promotes disease.