| 摘要 |
PROBLEM TO BE SOLVED: To easily manufacture a compact fan forced heater with high blowing efficiency and stable performance by folding one component to form at least four surfaces, including a surface forming a bellmouth, of six main surfaces constituting a box-shaped duct. SOLUTION: One single component is folded to make at least four surfaces, including one surface forming the bellmouth 16, of six main surfaces constituting the box-shaped duct 12. Stable blowing performance and high stiffness of the duct can be obtained without irregularities of assembly dimension or gaps, which have occurred between conventional ducts and bellmouths. As for the manufacturing aspect, it is also possible to streamline the number of part items and the assembly man-hours. COPYRIGHT: (C)2003,JPO
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