Could you post a picture of it? I looked at the back of my top vented koker, and I couldn't see any room for a rear exhaust so I can't picture in my head how it is positioned on yours. But, I wouldn't worry about damaging your convection blower, Keystoker wouldn't put it there if it wasn't safe. If you look at your blower, the motor is centered within the fan housing so heat from outside really shouldn't bother it. During times of high heat output (highest stove pipe temps), your convection fan would be running anyways which cools the fan motor by default. If you are concerned about the filter being close, you can put a heat shield between the filter and the stove pipe. A piece of metal or Reflectix Reflective Insulation would do the trick.