FIELD: fire detectors.;SUBSTANCE: claimed group of inventions relates to aspirating smoke fire alarms. In aspiration detector, air channel (2) value gradually increases from pipe inner diameter to cross section of axial fan (3), inlet of air sampling channel (4) is located near inlet branch pipe (1), and the outlet is close to axial fan (3), the air sampling channel (4) is connected to smoke sensor (5) compartment, at the outlet of which fan (8) is installed, fan (8) output through output channel (7) is connected to the lower part air channel (2), device for control and generation of output signals (9) is connected to smoke sensor (6), to axial fan (3) and to fan (8).;EFFECT: technical result consists in increasing air flow velocity in pipe and obtaining reliable air samples.;2 cl, 2 dwg
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