Wiktionary
airproofed
a. That has been made airtight
Usage examples of "airproofed".
Haitians and Vietnamese filled the place up, and the feds airproofed the buildings and installed giant electric air filters before proceeding.
It's also the only part of the colony that's radiation-proofed for anything up to a major solar flare and airproofed against a level six or better meteor impact.