This can be the leading cause for foul HVAC odors for many homeowners, which raises concerns about indoor air quality. Another indicator of an indoor air quality problem is the smell of dirty socks. Although this smell may be coming from the air conditioning unit, it is not actually the unit that is the problem.
Device. 1  Ratchet (device), a mechanical device that allows movement in only one direction. 2  Ratchet, a tool also known as a socket wrench. 3  Ratchet (instrument), a type of music instrument.
1 A pawl, click, or detent for holding or propelling a ratchet wheel, or ratch, etc. 2  A mechanism composed of a ratchet wheel, or ratch and pawl. 3  A ratchet wrench. ( analogous) A procedure or regulation that goes in one direction, usually up.