In your air conditionerâs inside unit, there is a fan that moves air throughout your home. The fan motorâs bearings can wear out, causing the motor to overheat and give off a burning smell. Without going into too much detail, the capacitor is the part that helps the motor run.
a ratcatcher shirt is pretty much an english show shirt (with the high-ish collar and the little peice of fabric that fastens over it) however, when many people are talking about ratcatchers they are referring to the unattached collar piece - here's a pic if that didn't make sense!
In British English, a shirt is more specifically a garment with a collar, sleeves with cuffs, and a full vertical opening with buttons or snaps (North Americans would call that a dress shirt, a specific type of collared shirt). A shirt can also be worn with a necktie under the shirt collar.