31. The handyman ventures this opinion : the air bubbles might be caused by blocked or partially blocked vent pipe . 32. If you get a blockage, start looking for it where the horizontal drain exits from the vertical vent pipe . 33. Another fix is to extend the vent pipe vertically, outside, for about 2 feet, and put a cap on that. 34. Due to the lack of vent turbulence and vent pipe resonances, many prefer the sound of PRs to reflex ports. 35. A vent pipe and fan are used to draw the radon from under the sheet and vent it to the outdoors. 36. The principal mechanism of ventilation in VIP latrines is the action of wind blowing across the top of the vent pipe . 37. The gas generator vent pipe was also changed to point outward and away from the missile instead of directly underneath it. 38. A metal vent pipe rises from the roof ridge at the south, with additional pipes coming out of the western wall. 39. Unpleasant fecal odors from the pit contents are thus sucked up and exhausted out of vent pipe , leaving the superstructure odor-free. 40. However, if the latrine is dark inside, the only light they can see is at the top of the vent pipe .
