Harper plucked the oilcloth free and jammed the burning concoction of dripping pitch and straw on to the venthole.    From Wordnik.com.  [Sharpe's Siege]

There had been no time to run the one remaining cannon into a firing position and Harper, regretting the lost chance, went to check that the quickfuse still led through the cleared venthole to the charge.    From Wordnik.com.  [Sharpe's Siege]

It was erected at the end of the casemate opposite the door and below the venthole through which daylight penetrates.    From Wordnik.com.  [The Memoirs of Victor Hugo] Reference

They covered it with Oahu mats, for a carpet; stopped up the venthole in bad weather, and made it their head-quarters.    From Wordnik.com.  [Two years before the mast, and twenty-four years after: a personal narrative] Reference

The strength of the solution is maintained by spare crystals of sal-ammoniac lying on the bottom of the cell, which is closed to prevent evaporation, but has a venthole for the escape of gas.    From Wordnik.com.  [The Story of Electricity] Reference