Heat transfer

Radiation

Conduction

Convection

Moisture transfer

Diffusion

Capillary action

Convection

Liquid flow

Air pressure in houses

Wind

Gravity

The Stack Effect

Exhausts

Natural

Mechanical

 

Duct accidents

Leaky Supply Ducts
Leaky Return Ducts
Accidental Mechanical Ventilation

Combining the Stack Effect with Exhaust

Building Ventilation

Foundation

Walls

Roof