This is when equipment is used to mix water with the foam concentrate to proportion the foam. Proportioning of the foam concentrate is at 1%, 3% or 6%. This means that 3% proportioning 97% of the finished foam is water.
Foam systems are designed in accordance with international standards, depending upon the risk to be protected. The standards applicable are as follows:• BS 5306 part 6.1 - low expansion foam
• NFPA 11 - low expansion
• NFPA 16 - foam enhanced sprinkler systems
• NFPA 11A - medium and high expansion
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