If your SOG Fan has stopped working, and you have a standard sog system with the filter on the outside of the door then this is the replacement you need.
To determine how old your sog fan is inspect the fan itself and there should be a small rectangular sticker on the face which is obscured by the filter so you will need to remove the filter housing cover (undo the two self tapping screws on the underside of the cover and the cover flap simply lifts off) then remove the filter itself to access the fan.
On the sticker are a few lines of text/numbers as shown in the picture. The second line has 4 numbers at the beginning which is the manufacture date. the first 2 digits signify the year and the last two are the week. So in our example the fan was manufactured in week 18 of 2009.