1. I can't give exact temps, I never probed. I have a small under the counter size fridge that has the 2 vents, upper and lower outside. Before I added the exhaust fan, the counter area above the rear of the fridge got surprisingly "warm" to say the least in 80F weather. After the fan was installed, the counter never got warm again.
2. Exact model, unknown but it's a 12V 5" x 5" computer style that had a small 3 way switch, hi/med/low feature. It's wired via fuse to the electrical board at the back of the fridge, there were 2 OEM open spade connectors for installing a fan. I built a small mount for the fan and screwed it into the wooden frame behind the upper vent to exhaust the hot air from the coils. The fan is standing upright.
3. Even on the low setting you can feel the warm air being exhausted, the fridge cools down twice as fast and maintains freezer and fridge temp at a higher setting than previous.
