Exhaust air from the fan must reach the exit in the open. So you need to select a channel, the fan either on the roof or a side wall. If possible, run the channel on one side of the wall, as this helps you to avoid shingle-work, and the possibility of roof leaks.
Ideally, the rule of thumb for vent location to choose a location that:
Provides a direct path from the fan to the outside.
Distance from the fan to the starting point is 6 meters long or less.
In the shower room is located in the vicinity (but not in) the shower, bath or shower, shower/tub combination, because this is the area that produces most of the moisture.
Sharp elbows, bends, avoids in the pipes.
You drill a locator hole in the middle of the site.
Cut The Outside Vent Position
Depending on where you intend to exhaust air to the outside, access to either the side wall or the roof of the house.
You bring your round vent (for walls) or vent cap (for the roofs). Also, you bring your saber saw, cordless drill, pencil and silicone caulk. Bring the round vent or vent cap over the locator hole. With the pencil, scribe a circle where the vent plug or cap to fit.
You use the saw, the saber, cutting the circle. Use the locator hole as a starting point for the saw blade. Attach the round vent or roof cap with screws, first apply sealing silicone to ensure a waterproof fit.
Cut the Inside Opening for the fan
Use the stud finder, locate the joists in the ceiling in the bathroom and lightly mark with a pencil.
If the fan comes with a paper template, use these mark the location of the fan in the ceiling. If there is no template, use the metal fan housing itself (leave the fan Assembly off for now). Many bathroom fans bolt directly to the side of the bar. If Yes, set the template or the housing parallel to a carrier in the manufacture of cut-lines.
Cut the drywall carefully with the jab saw.
You attach the Fan to bar
Access to the attic and bring your light, cordless drill, screws, and bathroom fan housing (the metal box that holds the fan).
You put the fan into the cut-out hole, so that the lower edge of the fan is flush with the drywall to the underside of the ceiling. You need a partner for this step so you can see the ceiling from this position.
Screw the fan into the side of the bar with the cordless drill.
If you do not use the page bar to attach, your fan may come with hangers. If not, you can purchase them separately. They offer the opportunity to be a fan, suspended in a position that is not next to a bar.
While they are still in the attic, and put the electrical wire through the side of the housing, so that about 7 in. the wire extends into the housing.