| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of an air filter made of unwoven cloth, i.e., because of no heat insulation performance while the air filter has high ventilation performance, the cold air of the outdoor side flows in to cool indoor air warmed by a heating device in winter, and the warm air of the outdoor side flows in to warm indoor air cooled by a cooler in summer causing wasteful electric consumption of a cooling and heating device.SOLUTION: An air filter of the present invention is fitted in the air inlet of a 24-hour ventilation system, formed by including a silica nano porous body in a base material having porosity of 70% or higher, and has a thickness of 5 to 15 mm, and a density of 0.12 to 0.20 g/cm. The base material is synthetic resin unwoven cloth or a soft synthetic resin foam containing continuous bubbles. |
