A building under construction is 150 feet long by 80 feet wide. Fire extinguishers have a maximum travel distance of 100 feet. What is the minimum number of fire extinguishers required for proper coverage?
Correct Answer
A) 6
With a 100-foot maximum travel distance, extinguishers must be positioned so no point in the building is more than 100 feet away. For a 150×80 foot building, 6 extinguishers would be needed to ensure complete coverage.
Why This Is the Correct Answer
For a 150×80 foot building with 100-foot maximum travel distance, extinguishers must be strategically placed to ensure no point exceeds the travel distance. The building's length of 150 feet requires at least two rows of extinguishers since 150 > 100. With the 80-foot width, you need 3 extinguishers per row (one at each end and one in the middle) to cover the length adequately. This results in 2 rows × 3 extinguishers = 6 total extinguishers for complete coverage.
Why the Other Options Are Wrong
Option B: 8
Eight extinguishers would provide more than the minimum required coverage, making it an inefficient and costly solution that exceeds code requirements.
Option C: 4
Two extinguishers would be insufficient as they could not provide adequate coverage for a 150-foot length, leaving areas beyond the 100-foot travel distance requirement.
Memory Technique
Remember 'Length over Limit = Layers' - when building length exceeds travel distance, you need multiple layers (rows) of extinguishers
Reference Hint
Florida Building Code Chapter 9 - Fire Protection Systems, or NFPA 10 Standard for Portable Fire Extinguishers
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