The ceiling fan direction in winter should be rotating clockwise or reverse. Warm air rises and gets trapped near the ceiling so when the ceiling fan direction is in reverse mode it circulates the warm air from the ceiling to the floor helping take the chill out of the air.
A reactant is a substance that is being used up or consumed in a chemical reaction. It is needed in large amount as compaed to reagent. A reagent is something which is used to initiate a reaction and aids to carry out it and it is also consumed in a reaction, unlikely to catalysts which are not consumed in a reaction.
A formant, as defined by James Jeans, is a harmonic of a note that is augmented by a resonance. Speech researcher Gunnar Fant defined formants as the spectral peaks of the sound spectrum |P(f)|. In acoustics generally, a very similar definition is widely used: the Acoustical Society of America defines a formant as: a range of frequencies [of a complex sound] in which there is an absolute or relative maximum in the sound spectrum.