There are two types of lüften, called “Stoßlüften” (shock ventilation) and “querlüften” (cross-ventilation). The former requires windows in a single room to be opened for a short, intensive period.

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The Craven County Sheriff's Office said John Matthew Nigh was discovered missing from his cell at 4 p.m. Sunday, and that his cellmates helped conceal his escape.

Their subsequent search determined he had apparently escaped through the ventilation system in the ... "JMN," tattooed on his upper left arm and a cross tattooed on his upper right arm.

A multi-agency manhunt is underway after an inmate escaped a North Carolina jail by sneaking through the ventilation system ... He has a beard and tattoos — a cross on his upper right arm ...