To provide a system for dividing a place into a smoking section and a non-smoking section capable of improving smoke blocking effect of an air cleaner in a space as small as possible and capable of efficiently blocking smoke.

This system for dividing a place into a smoking section and a non-smoking section is provided with a table type air cleaner 30 for sucking air over the cleaner from an upper part thereof to blow out from a lower part thereof and a smoke blocking partition having a first partition 10 and a second partition 20. The first partition 10 is provided with a lead-in opening 11 directly connected to a blow-out opening of the air cleaner 30 to receive a blowing flow and a first flow passage continued to, at least, the second partition 20. On the other hand, the second partition 20 has a second flow passage communicating with the first flow passage, and the second partition 20 is provided with a shielding opening 23 for discharging the blow-out flow led into the second flow passage from an end of the second partition 20 toward a place in rear of a smoking space provided in a position facing to the first partition 10.

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