Water Damage Restoration Technician (WRT) Certification Practice Test

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What is the typical relative humidity level that conventional refrigerant dehumidifiers can reduce high humidity to?

30% RH
40% RH
50% RH
60% RH

The correct answer is: 40% RH

Conventional refrigerant dehumidifiers are designed to control moisture levels by cooling the air, which allows water vapor to condense and be removed as liquid. Typically, these systems can effectively reduce relative humidity levels to around 40% RH. This level is often considered optimal for maintaining comfort and preventing mold growth, as it strikes a balance in reducing excessive moisture while not overly drying the air. In residential and commercial settings, achieving around 40% RH with dehumidifiers helps create a more comfortable environment and protects structures and furnishings from potential damage caused by higher humidity levels. Understanding this capacity is essential for water damage restoration professionals, as managing humidity is a critical component of effective moisture mitigation.