Ventalation

Ventilation must be provided at the top of the column by the installing contractor. Continuous air circulation up through the column is an absolute necessity. All warranty claims will be voided if columns are not properly ventilated. To figure the minimum total opening required at the top and bottom of the column, divide the bottom shaft diameter by two. This will give you the minimum square inches required top and bottom. For example, an eight (8) inch bottom diameter column would require four (4) square inches of ventilation at both the top and the bottom. At right on this page are details showing the two acceptable methods of venting. Any other method is not acceptable and would void the warranty.