> it's less of an issue. The situation that would warrant this would likely also warrant full PPE just to enter a unit or building.

Isn't it still important not to spray covid everywhere?

See for example this post: https://emcrit.org/emcrit/covid-airway-management/

> Critical Note: If you use the vent for preox, you MUST disconnect the vent circuit proximal to the viral filter before removing the mask. Otherwise, COVID will be sprayed all around the room!!!!! See Triple C below.

{EDIT: genuinely don't know why this got downvotes.}