Look up: forced-air

1. 
   forced-air
   a wood seasoning process designed to accelerate drying rates by increasing the movement of air,sometimes heated but lacking humidity control,through open stacks or loads of timber with the aid of fans Category: Various industries and crafts • a semiconductor device in which heat evolved during operation must be removed by means of a heat sink,and in which air must be blown across the h...
   Found on http://www.mijnwoordenboek.nl/definition
   
   
2. 
   Forced-air
   A `Forced-air ` or `Warm air` heating system is one which uses air as its heat transfer medium. These systems use ductwork and vents as a means of air distribution. The return plenum carries the air from several large return grills (vents) to a central air handler for re-heating. The supply plenum directs heated air from the central unit to the rooms which the system is designed to heat. Regardless of type, all air handlers consist of an air filt...
   Found on http://en.wikipedia.org/wiki/Forced-air