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First determine the total square footage of both floors. Second, determine the hazard occupancy (low, moderate, or high) by reading examples written in the NFPA10, 2007 Edition, Standard For Portable Fire Extinguishers on page 10-23.
If you are installing 10 lb. ABC Dry Chemical extinguishers (the most common type and size), most of them are UL rated at 4-A. A 4-A extinguisher will protect the following: low hazard occupancy - 11,250 sq. ft. ;ordinary hazard occupancy - 6,000 sq. ft. :high hazard occupancy - 4,000 sq. ft. Next divide your total square feet by the square feet of the occupancy hazard and you have your MINIMUM number of 4-A rated fire extinguishers required. You may have to add extinguishers due to the building layout. From any place in the building, you have to be able to walk to a fire extinguisher in no more than 75 feet (75 foot maximum travel distance). Lastly if there are any special hazards (computer room, electrical room, flammable liquids, etc.), they should be protected separately in addition to the building's fire extinguishers.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoThere should be one for each floor of the house.
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