Positive Pressure Cooling
Positive Pressure Ventilation
Traditional negative pressure applications are being phased out as Positive Pressure is a trending method of increasing environmental protection from outside pests as well as offering much better control of temperature and humidity. Positive pressure cooling systems pull outside ambient air into a cooling chamber where the air is screened for bugs, then chilled through evaporation. This bug free chilled air is then forced into the greenhouse through ducts evenly to distribute the air to the other end of the greenhouse allowing it to escape the the air to the other end of the greenhouse allowing it to escape the duct evenly along its journey.
The temperature difference of the air from beginning to end may only increase 1 or 2 degrees, as where traditional negative pressure cooling may increase as much as 20 degrees from one end of the greenhouse to the other. In this method, the entire greenhouse air is not being exchanged, rather, the crop canopy is always having fresh chilled air blowing on it. By force-fully blowing this chilled air under the plants, it escapes the opening passing through the soil or root structure of the plants, then forcing its way through the canopy. In this design, the leaves are constantly moving helping to strengthen the plants, cool the plants, as well as fight off white mold and other diseases especially in the flower stage of cannabis while also providing enough air flow to force away any insects that may already be in the greenhouse.