TFL type centrifugal ventilation system is a new type of DC ventilation system, using indoor and outdoor temperature differences, introducing cold air, releasing hot air, having a large ventilation volume, high efficiency, saving energy and other advantages. TFL type centrifugal ventilation system is a new type of DC ventilation system, using indoor and outdoor temperature differences, introducing cold air, releasing hot air, having a large ventilation volume, high efficiency, saving energy and other advantages A ye tɔ̈ɔ̈u në tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ de tɛmɛ