Thermovent Tracheostomy 1200 Portex, Box of 20 (100/582/000)High efficiency HME paper elements. Recovers approximately 75% of the energy and moisture that would otherwise be lost through respiration . Low resistance to flow. Minimises pressure build and reduces the work of breathing for weaning off the ventilator. Small dead space. Suitable for both ventilated and spontaneously breathing patients. Full compatibility with breathing systems or masks.