If a sample size of dry-type sprinklers were sent off for testing and passed in 2020, what year would they need to be sent off for testing again?

The correct answer hinges on the testing frequency for dry-type sprinklers as specified by relevant codes and standards, such as those from the National Fire Protection Association (NFPA). Typically, dry-type sprinklers undergo testing every five years to ensure they maintain their reliability and efficacy in fire suppression.

Given that a sample of dry-type sprinklers passed testing in 2020, following the established five-year interval means they would need to be sent off for testing again in 2025. This five-year timeline is crucial for ensuring that the sprinklers remain compliant with safety standards and operate correctly over time. Therefore, if the initial testing was conducted in 2020, the next round of testing aligns with the five-year requirement, leading to 2025 being the correct year for the next evaluation.