Drop Ceiling Exhaust Fan - I always wondered why the ceiling fans that were older didn't have a reverse button. The people that designed those fans, just too stupid to think about used reverse in winter?
During winter, when you utilize the central heating system, the warm air coming out of the registers, in each room, will naturally rise and because the registers are up high already, the hot air will build in the ceiling level and slowly work its way down toward floor level. Before the temperature is comfortable at the low amounts of the rooms, the heating unit runs. However, by the time this occurs, it will be quite hot in the ceiling level.
However, imagine if there was a strategy to get this hot air down to the lower levels, off the ceiling where we live. The heating unit would not need to work as long as well as the savings on our utility bill may be considerable. This mixing would essentially equalize the temperature at floor and ceiling levels, meaning that the heat would not be wasted keeping the ceilings warm.
But someone said the draft developed by the ceiling fans would be too much for winter months. So someone else said "well, let us just reverse the ceiling fans and allow the air blow up until it hits the ceiling and then it is going to go flat in most ways until it hits the walls. Then it will come down until it hits on the floor. Now it's going to go, toward the middle of the room, back in at floor level and then back up to the ceiling fan.