SKYWALKER, HISS - BREATHING APPARATUS, INHALE AND EXHALE

This's a Skywalker Sound sound effect probably designed by Gary Rydstrom and debuted in "Backdraft" (1991). It is NOT to be confused with Darth Vader's Breathing Sound.

Movies

 * Backdraft (1991) (debut)
 * Toy Story (1995) (Heard once for the inside Buzz's helmet)

Audio Samples
Either Toy Story or Backdraft will do.