1.   Chiefly, many cigarettes now use porous paper and have ventilation holes on their filter tips.

2.   Each of the four sides of the aluminum tray has three ventilation holes.

3.   Originally invented for use by surgeons in operating rooms, the cushioned clogs have ventilation holes on the tops and sides and massaging bumps on the insole.

4.   Over the next few hours ventilation holes were poked in the walls.

5.   The carrying handle is ringed by ventilation holes, enabling Apple to get rid of the noisy internal fan.

6.   Authorities in the Netherlands concluded that they suffocated in boxes that were closed and taped off with no ventilation holes, he said.

7.   His correspondent, opposition member of Parliament Lim Guan Eng, sits in a dingy cell with only a ventilation hole in the ceiling.