1.) With a hot attic and no wind, the expanded attic air is at higher pressure than outside air. Put a hole in the roof and the hot high pressure air will move outside to equilize pressure. Put a roof turbine on that hole, it starts spinning, but it is blocking the flow of air to the outside, not speeding it up. If it did, then it's as if you had some sort of a perpetual motion machine.
How these diseases spread depends on the specific disease or infectious agent. Some ways in which communicable diseases spread are by: physical contact with an infected person, such as through touch (staphylococcus), sexual intercourse (gonorrhea, HIV), fecal/oral transmission (hepatitis A), or droplets (influenza, TB)
Many infectious diseases are not contagious because they are only strewn via other means, for instance ticks, fleas, food, water or animals. A contagious disease can be dispersed in couple of ways, commonly: 1  feces from an infected person. 2  air travel propelled by a sneeze or cough.any infectious diseases are not contagious because they are only strewn via other means, for instance ticks, fleas, food, water or animals. A contagious disease can be dispersed in couple of ways, commonly: 1  feces from an infected person. 2  air travel propelled by a sneeze or cough.