What is the difference between primary aspirated (aspirated) and secondary aspirated (unaspirated) foam?

Nowadays, low expansion foam is again sub-divided into two types :

Primary aspirated foam          : mixing of foam solution with air occurs inside the equipment, resulting in expansion ratios from 1:7 to 1:12 (e.g. foam branches, foam barrels)

Secondary aspirated foam     : mixing of foam solution with air occurs after solution leaves the nozzle, resulting in comparatively lower expansion ratios i.e. 1:3 to 1:6 (e.g. Aqua foam nozzles, handline nozzles)

It may be noted that for secondary aspirated foam, only certain types of foam concentrates (AFFF, AR-AFFF, FFFP) will give proper results.

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