NFPA Recommends Draining Antifreeze in Residential Sprinklers

The National Fire Protection Association (NFPA) has issued a safety alert recommending that residential fire sprinkler systems containing antifreeze should be drained and the antifreeze replaced with water.

The alert follows a research study and an initial set of fire tests conducted after a fire incident raised concerns about antifreeze solutions in residential sprinkler systems. The incident involved a grease fire in a kitchen where a sprinkler with a high concentration of antifreeze deployed. The fire resulted in a single fatality and serious injury to another person.

“Fire sprinklers are one of the most effective ways to save lives and property from fire,” says NFPA President James M. Shannon. “Until we can provide further information based on additional research that is currently underway, we are urging the public to continue the use of sprinklers but to follow our interim safety guidelines by removing antifreeze if it is in their sprinkler systems.

Shannon said based on testing conducted, 70/30 percent glycerin and 60/40 percent propylene glycol antifreeze may provide an unacceptable risk of harm to occupants in certain types of fire scenarios, in particular kitchen grease fires. There were successful tests where kitchen grease fires were extinguished or contained with a 50/50 percent glycerin solution but it was felt there should be additional testing to more fully understand if there is a risk associated with 50/50 percent glycerin solution.

Until the results of further testing on antifreeze are available, NFPA recommends the following:

  • If you have,    or are responsible for, a residential occupancy with a fire sprinkler     system, contact a sprinkler contractor to check and see if there is     antifreeze in the system.
  • If there is     antifreeze in the system, as an interim measure, drain the system and     replace it with water only. Problems associated with freezing of sprinkler     pipes can be mitigated by alternative measures such as insulation. NFPA     hopes to provide further guidance based on additional testing before the     winter freezing months.
  • If you are     putting in a new residential sprinkler system, design and install a system     that does not require antifreeze.

“We are providing this safety alert as interim guidance based on the information we have right now,” says Shannon. “As soon as more information is available, we will update the public.”

The NFPA Safety Alert Regarding Antifreeze in Residential Sprinklers and more information on this topic can be found at


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