Water Damage Restoration Technician (WRT) Certification Practice Test

Which formula should be used to determine the number of dehumidifiers needed based on total PPD?

1. Cubic Footage x Chart Factor = Total PPD

2. Cubic Footage ÷ Chart Factor = Total PPD

3. Total PPD x Dehumidifier Rating = # of Dehumidifiers

4. Total PPD ÷ Dehumidifier AHAM Rating = # of Dehumidifiers

The correct answer is: Total PPD ÷ Dehumidifier AHAM Rating = # of Dehumidifiers

To determine the number of dehumidifiers needed based on the total PPD (pints per day) of moisture in the air, the formula used is Total PPD divided by the dehumidifier's AHAM (Association of Home Appliance Manufacturers) rating. This approach ensures that you are matching the moisture removal capacity of the dehumidifiers to the actual moisture load present in the environment. The Total PPD reflects the overall humidity level that needs to be addressed for effective water damage restoration. The AHAM rating, on the other hand, is a standardized measure of how much moisture a dehumidifier can remove in a day under specific test conditions. By dividing the total moisture load (Total PPD) by the capacity of a single dehumidifier (AHAM rating), you arrive at the precise number of dehumidifiers required to adequately manage the moisture in that space. Utilizing other formulas would not accurately reflect the relationship between the moisture levels and dehumidifier capacity, leading to potential under or overuse of dehumidification equipment. Consequently, using the correct formula is crucial for achieving effective moisture control and ensuring successful restoration efforts.