- also, depending on the type of furnace blower motor you have (is it single, double or variable speed) the amount of heat recovery may not make much of a difference during certain times, but that's probably when you are out of the house. there was a lot of head scratching at this point as i tried to determine how exactly this was supposed to be assembled. when the oil is applied, they will become darker and achieve the smooth looks. in short, opportunities for a healthy gulf and fishing industry are possible again. ruth morse seemed farther removed than ever. 