1. heat exchanger air to air core 2. hexagon,counterflow 3. functional paper, 62g/ ... series of products of heat exchanger core:heat exchanger air to air coreTotal heat exchanger(sensible and latent heat) core:CharacteristicApplication ... heat-recovery systemsSpecial enthalpy material,Countercurrent heat exchange mode,efficiency high to 75%,ABS frame structure,low flow resistance,no distortion,tightness ...