| 摘要 |
PURPOSE:To improve the collecting rate without employing a larger sized fan by a structure wherein a Coanda effect plate is arranged at the position, to which the updraft developed at a gas range contacts, at the rear of the gas range. CONSTITUTION:A Coanda effect plate 4 is attached near the ascent of exhaust gas 8 developed at a gas stove 3 between the gas stove 3 and a range hood 6. Due to the attachment of the Coanda effect plate 4 in the above-mentioned manner, the exhaust gas forms a concentrated ascending air current along the Coanda effect plate without diffusing to the indoor side, resulting for almost all the gas in being caught by the range hood 6 and sucked by a fan 9. When the exhaust gas flow rate is set 30 times the conventional exhaust gas flow rate or 240m<3>/h, the collecting rate is 80%. However the fan flow rate of 140m<3>/h is enough for obtaining the collecting rate of 80% by using the Coanda effect plate 4. Further, when the fan exhaust gas flow rate is set 30 times under the condition that the Coanda effect plate 4 is used, the collecting rate exceeds 90%.
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