Water Damage Restoration Technician (WRT) Certification Practice Test

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How many LGR dehumidifiers are needed for a Class 2 water loss with 18,000 cubic ft. if each removes 72 pints at AHAM test conditions?

  1. 3 Dehus

  2. 5 Dehus

  3. 8 Dehus

  4. 10 Dehus

The correct answer is: 5 Dehus

To determine the number of low-grain refrigerant (LGR) dehumidifiers needed for a Class 2 water loss with an area of 18,000 cubic feet, it is crucial to understand the moisture removal capability at AHAM (Association of Home Appliance Manufacturers) test conditions. Class 2 water losses typically involve water that has saturated the materials like drywall and insulation but is not as extensive as Class 3 or 4 losses. The goal in this scenario is to effectively reduce the humidity levels in the air. Each LGR dehumidifier mentioned has the capacity to remove 72 pints of moisture per day. To find out how many dehumidifiers are necessary, you start by calculating the moisture load. The general rule of thumb for maintaining a dry environment after a water loss is to remove approximately 1 pint of moisture per 1,000 cubic feet per day. In this case: 1. Calculate the total moisture load: For 18,000 cubic feet, this would be 18 (pints per 1,000 cubic feet) x 18 = 18 pints. 2. Determine the number of dehumidifiers required: Since one LGR dehumidifier removes 72 pints per day,

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