Differences in Derale Fans
I have two of the derale 16925 pushers on the front of the condenser, and it doesn't get enough air to the radiator. I think I can make enough room to put one on the back of the radiator. Looking at Derale's pictures it looks like the fan blades are identical. I wanted to verify swapping polarities would still flow good as a puller, before going through the hassle of changing everything around.
Called derale and the guy wasn't much help. At first he acted like they were the exact same fan, then said the blade design might be different cause the pictures are generic and the only way to know would be to try it.....




