Termofan heat recovery units are designed for saving energy and also improving indoor air quality. TF-CHR units provide the facilities of air-conditioning applications (residantial, commercial and industrial areas) by using cellulosic exchangers, recovering heat from air to air. The heat is effectively transerred from warm to cold air by the exchangers with high conductivity, efficiency and performance. The efficiency is considerably high since there is latent heat transfer besides the sensible heat transfer.