Attached are some pics of a Radon mitigation systems we just did for a relocation company in Weyauwega. The home did not have a sump pit, but did have gravel under the slab (yeah!) The garage was also detached, but the owners still wanted an interior route. We also insulated the pipe in the 1st floor closet to make sure noise would not be an issue. This is what a proper system should look like.
1st pic is of basement section, 2nd is 1st floor closet with insulation wrap, 3rd is attic portion, and 4th is pipe through roof with flashing.