Title:
VENTILATOR
Document Type and Number:
Japanese Patent JP3917398
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To securely prevent back flow of a ventilator provided with an electric fan unit.
SOLUTION: The electric fan unit 30 is fixed to a face on indoor side of a partition plate 20 fixed to a support frame 10, and an upper fringe part of a back flow prevention sheet 50 is fixed to a face on outdoor side and hangs down. A shielding plate 60 for hiding the back flow prevention sheet 50 is fixed to the support frame 10. An internal space 16 whose lower end is opened is formed between the shielding plate 60 and the partition plate 20, and an opening 61 on outdoor side is formed between a lower fringe of the shielding plate 60 and a lower frame part 12 of the support frame 10. The opening 61 on outdoor side is positioned below a bleeder port formed in the partition plate 20 and is continuous with the bleeder port through the internal space 16. The back flow prevention sheet 50 leaves the partition plate 20 when forced exhaust is performed by the electric fan unit 30 to open the bleeder port 21 and adheres closely to the partition plate 20 when an outdoor pressure becomes higher than a discharge pressure of the electric fan unit 30 due to strong wind to close the bleeder 21 port.
Inventors:
Yoshiyuki Tanaka
Application Number:
JP2001313417A
Publication Date:
May 23, 2007
Filing Date:
October 11, 2001
Export Citation:
Assignee:
Sawara Co., Ltd.
International Classes:
F24F7/013; (IPC1-7): F24F7/013
Domestic Patent References:
| JP2001073645A | ||||
| JP60176040U |
Attorney, Agent or Firm:
Noboru Watanabe
Harada Sanjugi
Harada Sanjugi
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