Vent Useage

A common thing in the Toy Story franchise is that the toys need to travel throught vents and pipes on an adventure.

Toy Story
When Woody and the mutant toys plan their mission to save Buzz from Sid,Legs andDucky go through heating ducts of Sid's House.

Toy Story 2
Buzz, Rex, Mr. Potato Head, Hamm and Slinky, along with Bonus Belt Buzz they venture throught the vent system of Al's apartment to save Woody from Al.

Toy Story 3
Woody goes throught the vents of Sunnyside to rescue Buzz, Jessie, Bullseye and the others from Lotso, Later on. He and Slinky use the vents to catch the Monkey.

Small Fry
Buzz goes throught the vents of Poultry Palace.

Toy Story of Terror
Woody, Buzz, Jessie, Rex and Mr. Pricklepants fall down a vent hole in order to find Mr. Potato Head and Trixie. Later, Woody, Buzz and Jessie continue the adventure in the vents without Rex and Pricklepants (who have been snatched by Mr. Jones.)