HVAC Journeyman Practice Exam 2025 - Free HVAC Practice Questions and Study Guide

The recommended method of isolating evaporative coolers that are directly supported by the ground involves the use of a level concrete slab extending not less than 3 inches below the adjoining ground level. This approach is important because it ensures that the cooler is stable and properly supported, preventing issues related to moisture and soil movement. By positioning the slab a few inches below the ground level, it helps to reduce the risk of water pooling around the cooler and allows for proper drainage, which is particularly crucial in preventing damage from erosion or freezing conditions.

This design also aids in maintaining consistent performance of the cooler, as soil settling can impact the unit's operation if not properly mitigated. Adequate isolation from the surrounding ground helps avoid root intrusion and provides a defined space for maintenance which is essential for the longevity and efficiency of the unit.