Infiltration (HVAC)
WordNet

noun


(1)   A process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection)
(2)   The slow passage of a liquid through a filtering medium
"The percolation of rainwater through the soil"
"The infiltration of seawater through the lava"
WiktionaryText

Noun



  1. The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body.
  2. The substance which has entered the pores or cavities of a body.
  3. The act of entering a physical location and/or organization secretly.
 
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