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Important: Static pressure requirements are significantly affected by the amount of make-up air supplied to an area. Insufficient make-up air will increase static pressure and reduce the amount of air that will be exhausted. Remember, for each cubic foot of air exhausted, one cubic foot of air must be supplied.

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Gravity Ventilators, or Passive Ventilation works on the concept of providing adequate air circulation for a space, while using no mechanical parts. They do not use fans, belts, or any kind of motor to drive air. Instead they work on pressure differential between the inside and outside of your construction project. Sometimes referred to as “windcatchers,” gravity ventilation is a great way to move air around a large space, without the use of electricity and without creating excess noise. Using the negative pressure created by the temperature difference of the warm air inside and the cold air outside, a gravity ventilator is an inexpensive solution to regulate temperatures in warehouses, commercial kitchens, and even large office spaces.

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To calculate the CFM required to adequately ventilate an area, we divide the room volume by the appropriate “Minutes per Change” value. [CFM] = [Room Volume] / [Min./Chg.]

Buying Gravity Ventilators can compliment your HVLS or Inline Fan equipped facility, and by strategically placing them around your site, you can actively create airflow at a fraction of the traditional cost. By choosing a Greenheck fan your HVAC solution will also be backed by the best warranty, support, and online resource library in the world.

To determine the actual number needed within a range, consider the geographic location and average duty level of the area. For hot climates and heavier than normal area usage, select a lower number in the range to change the air more quickly. For moderate climates with lighter usage, select a higher number in the range.

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Your local building codes should contain information pertaining to the suggested air changes for proper ventilation. The ranges specified will adequately ventilate the corresponding areas in most cases. However, extreme conditions may require "Minutes per Change" outside of the specified range.

Greenheck has been building the highest quality Gravity Ventilators since they were first designed in 1956. We have refined our construction materials and practices for over 70 years, meaning when you buy your Gravity Ventilators for your latest commercial building project, you can rest assured that your products have been painstakingly engineered to exacting detail with the finest spun aluminum. Choose between the GRS and GRSF models depending on the design of your roof.