Installing bathroom-exhaust-fans the easy wayNow, lets move on to bathroom-exhaust-fans and the more complex bathroom fan light heater units for ventilation. These fans can be put in as part of the finish work, but as usual, the venting should have been done along with the HVAC before the insulation and sheetrock was put up. If you want a bathroom fan light heater unit, then you'll need to plan ahead in wiring before the walls go on. Most bathroom-exhaust-fans are important for more than the most obvious reason, they also pull moisture out of the air and deliver it outside. 
This helps prevent mold from growing in humid places. They are a snap to install if you use dryer vent.When installing the dryer vent, you’ll need to be careful not to twist or kink it. There is usually one exhaust vent on the roof or the side of the house in medium sized houses.
You’ll first need to cut a hole in the roof the size of the vent flange. The vent cover will completely cover the hole and the flange will stick into the hole and connect to the dryer vent. Connect the dryer vent with a hose clamp as in the pictures below.
Depending on your local codes, you can either vent to the roof or the side of the house. This is an inside view of side venting.
There are many different types of outside vents that look good. Side venting needs to have nice vent covers, because they are visible to everyone.
Connect the other end of the dryer vent to the fan outlet using another hose clamp. The wiring should have been run with the electrical so it’s just a matter of connecting the hot and neutral wires. Some fans are a fan, heater, and a light. In this case you will have three sets of wires to keep straight and run to a switch or switches as we’ve covered in the electrical section. Remember that all bathroom outlet switches need to be GFCI’s.
Bathroom fan light heater units are a little trickier, but not too difficult. You will need to use 12-3 romex from the switch to the unit. The switch will have three buttons to control each component. 
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