Patent ID: 8550151

Claim:
A heat exchanger comprising: a plurality of unit devices, each including: a heat exchanger plate; a spacer rib for keeping a spacing between the heat exchanger plate and an adjacent heat exchanger plate of an adjacent unit device; and a shielding rib for shielding leakage of airflow, wherein the spacer rib and the shielding rib are made of a resin having water-insolubility and a flame retardant property, the heat exchanger plate, the spacer rib and the shielding rib are integrally molded, the plurality of unit devices are stacked over each other to form airflow passages between the adjacent heat exchanger plates, the heat exchanger plate is made of a moisture permeable resin film having water-insolubility and a flame retardant property, the airflow passages allow a first airflow and a second airflow to pass therethrough and to exchange heat through the adjacent heat exchanger plates, and the moisture permeable resin film is a three-layer composite moisture permeable resin film formed by joining a hydrophilic moisture permeable resin film having water-insolubility, a flame retardant property, and a gas shielding property to one surface of a porous resin film having water-insolubility and a flame retardant property, and joining a porous resin substrate having water-insolubility, a flame retardant property, and breathability to an other surface of the porous resin film.