| 摘要 |
PROBLEM TO BE SOLVED: To provide a tracer gas supply ring used in measuring the cooking-exhaust trapping efficiency of a ventilation hood for trapping cooking exhaust from a cooking container larger than that for domestic use, and capable of approximately uniformly generating a tracer gas from the whole cooking container. SOLUTION: The tracer gas supply ring 1 is disposed on the cooking container C opened at its upper part. The tracer gas supply ring has a pipe (ejection pipe 2) disposed at an inner side of an upper edge of the cooking container C at a prescribed interval and having a circular shape in a plane view, a plurality of supply parts 3 disposed in the circumferential direction of the pipe at prescribed intervals and supplying the tracer gas into the pipe, and a plurality of ejection holes 4 formed on an lower face of the pipe at prescribed intervals in the circumferential direction. COPYRIGHT: (C)2011,JPO&INPIT
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