1.   Barrel-size ventilation tubes hang from overhead.

2.   A ventilation tube was placed in his eardrum until the blockage was surgically removed, the researchers said.

3.   After about a year, most ventilation tubes fall out on their own.

4.   For this reason, among others, doctors have often recommended treating early ear infections with ventilation tubes.

5.   Huge ventilation tubes of shiny steel extend the length of the barroom ceiling.

6.   The study found that ventilation tubes did not have a substantial effect on language development in the children.

7.   Treatment with ventilation tubes was compared with watchful waiting in children with persistent otitis.

8.   Ventilation tubes snaked everywhere.

9.   Instead, Earthships are powered by solar panels and windmills, heated with sunshine, cooled with underground ventilation tubes.