HVAC Journeyman Practice Exam

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When installing an evaporative cooler, openings in exterior walls shall be what size compared to the duct?

1 inch larger than the duct
3 inches larger than the duct
flashed in an approved manner
the same size as the duct

The correct answer is: 1 inch larger than the duct

When installing an evaporative cooler, the guidelines recommend that openings in exterior walls should be 1 inch larger than the duct size. This allowance is essential for ensuring proper airflow and accommodating any variations in the ductwork during installation. A slightly larger opening helps to avoid obstruction, allowing for efficient air movement, which is crucial for the cooler's performance. By having this additional space, it also facilitates easier installation and adjustment of the duct if needed, without compromising the seal or connection between the duct and the wall. Proper sealing around the duct is essential to prevent air leaks, maximize the system's efficiency, and promote adequate cooling within the space being served. The other considerations, such as having the openings flashed in an approved manner or matching the size exactly to the duct, may address other aspects of installation but do not specifically promote the necessary airflow and installation flexibility as effectively as providing a 1-inch larger opening. This practice helps ensure that the evaporative cooler operates efficiently and effectively throughout its use.