When inspecting a building with quick response sprinklers over 20 years old, how many sprinklers need to be sent off for testing if there are 800 concealed, 300 upright, and 200 pendant sprinklers?

For quick response sprinklers that are over 20 years old, it is a standard practice to test a certain percentage of the total number of sprinklers installed, particularly for those in concealed spaces where they might be more vulnerable to obstructions and accumulation of debris.

In this scenario, the total number of sprinklers is the sum of concealed, upright, and pendant sprinklers, yielding 1300 sprinklers. Based on the applicable codes and standards for testing aging quick response sprinklers, the correct procedure generally requires testing a specific percentage of the total. For quick response sprinklers that have been in service for more than 20 years, the common requirement is to test 1% of the total quantity.

Calculating 1% of 1300 gives you 13 sprinklers that need to be sent off for testing. This aligns with the standard practices within fire protection engineering to ensure that the sprinklers will operate effectively in emergency situations. Hence, the choice indicating that 13 sprinklers need to be tested reflects the proper adherence to these guidelines.