joists 58 while roof sheathing 64 is fixed to the top side of rafters 60 the wall board 62 and roof sheathing 64 define an attic or upper space 70 for the building the ceiling joists 58 and roof rafters 60 come together and are secured in the area of the wall top plate 54 the roof rafters 60 extend beyond the wall top plate 54 and form eaves such as the one shown at 66 as is conventional the eave 66 is hollow and is covered along the bottom by sheathing which forms the soffit 68 and along its side by a fascia board 72 that is oriented perpendicular to the soffit 68 the attic or upper space 70 and the hollow eaves 66 are connected by openings defined between the roof framing members and specifically between adjacent pairs of ceiling joists 58 and roof rafters 60 the wall top plate 54 and the roof sheathing 64 as shown in fig2 the indoor unit 80 of a split system air conditioner i e the evaporator coil and expansion valve is commonly placed in the attic or upper space 70 of a building as previously mentioned the condensing unit not shown is usually placed.