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.
A ratcheting screwdriver incorporates a ratchet inside its handle, with a gear wheel and two pawls. A ratcheting screwdriver has a switch in its handle with which the user can choose which direction will be the restricted one. Thus, if driving a screw, clockwise is the restricted direction; that is, the handle won't be able to turn clockwise independently of the shaft.