| http://www.w3.org/ns/prov#value | - This is done as illustrated in FIGS. 3 and 4 by directing a cooling medium such as non-preheated secondary air through a separate supply 41 to the zone 40.3 and non-preheated air from nozzles 42 at the burner throat 44 to the zones 40.1 and 40.2.
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