Until now, Ordinary Hazard sprinkler systems using listed antifreeze were limited to a max volume of 40 gallons, far short of what many system designs would need. freezemaster™ antifreeze is now UL listed for use in volumes up to 375 gallons in Ordinary Hazard Groups 1 & 2 occupancies as defined by NFPA 13.
freezemaster™ antifreeze is the onlylisted antifreeze with this volume allowance; the others have a maximum volume of only 40 gallons!
Our updated listing now contains:
“Ordinary Hazard Groups 1 & 2 can use up to 375 gallons using the dry system hydraulic design criteria, where the system hydraulics are designed as a dry system even though the system is filled with antifreeze.”