hygroscopic condenser humidifier

hy·gro·scop·ic con·den·ser hu·mid·i·fi·er

(hī'grō-skop'ik kŏn-den'sĕr hyū-mid'i-fī-ĕr)
A passive humidification device that works by collecting heat and moisture on exhalation and returning it to inhaled gas.
Synonym(s): artificial nose.