Abstract: For fire prevention, an auxiliary cooling apparatus applied to an outdoor condenser of a refrigerating cycle is provided with a filter which has air permeability and is arranged to oppose to an ambient air intake port of the condenser, and cools ambient air by heat exchange between the ambient air sucked into the ambient air intake port through the filter and water supplied to the filter, lots of implanted fibers (17), which are fine projections, are implanted on surfaces of fibers (15), which constitute a base material of the filter, via a self-extinguishing adhesive agent layer (16), so that an adhesive layer (16), and the fiber (15) of the base material do not burn even if the implanted fibers (17) are ignited, whereby an auxiliary cooling apparatus which is excellent in the light of safety can be provided.

Abstract: For fire prevention, an auxiliary cooling apparatus applied to an outdoor condenser of a refrigerating cycle is provided with a filter which has air permeability and is arranged to oppose to an ambient air intake port of the condenser, and cools ambient air by heat exchange between the ambient air sucked into the ambient air intake port through the filter and water supplied to the filter, lots of implanted fibers (17), which are fine projections, are implanted on surfaces of fibers (15), which constitute a base material of the filter, via a self-extinguishing adhesive agent layer (16), so that an adhesive layer (16), and the fiber (15) of the base material do not burn even if the implanted fibers (17) are ignited, whereby an auxiliary cooling apparatus which is excellent in the light of safety can be provided.