What is Cross Ventilation from Moffitt?

Cross ventilation (also called Wind Effect Ventilation) is a natural method of cooling. The system relies on wind to force cool exterior air into the building through an inlet (like a wall louver, a gable, or an open window) while outlet forces warm interior air outside (through a roof vent or higher window opening). Modern natural ventilation systems help increase the flow of cool air coming in and assist the hot air going out. This increases building air flow naturally.

Knowing how the fresh air circulates within a structure. around the people inside, and through its openings is crucial to determining how to optimize cooling and improve air quality. You can find this by looking at the building’s inlets and outlets.

The Dynamics of Airflow Through Inlets and Outlets

cross ventilation window

A window or door’s orientation determines the amount of air flowing through the space. Usually, an inlet only works if the direction of the wind flow is in the range of -45° to 45° to the surface. Leading to a total of a ninety-degree range around the opening. Placement of air vents often made with consideration of this air movement.

When designing a cross effect system, consider both the inlet and outlet.  The amount of heat removed from a facility is directly affected by the vent’s inlet and outlet areas. If the inlet and outlet areas are large, then more air can travel through, meaning more heat can be removed. If the inlet area were greater than the outlet area, this would impede effective ventilation. More air would be coming in than could effectively go out, creating an unbalanced system. An equal amount of airflow volume going into a building as exiting the building is ideal.

Tips for Cross Driven Wind Cross Ventilation

cross ventilation diagramWhen designing a ventilation system that utilizes cross ventilation, the direction in which the window blows is the first concern.  Knowing the wind direction (at various times through the day, and during the year) will determines where inlet and exhaust vents can be placed.

Furthermore, special equipment can help to increase the effectiveness of a cross ventilation system. Products such as specialty wall fans can increase the movement of air across the work floor and through a building. Alternatively, non-powered options such as wall louvers and natural ventilators exploit the natural movement of air and increase air movement through a space without any electricity.

Moffitt Corporation is one of the most trusted names in ventilation. Moffitt designs ventilation plans, manufactures ventilation equipment, and even installs ventilation systems. This turn-key approach provides Moffitt with a top-to-bottom experience. Get the most out of a natural ventilation system.