Generators produce poisonous gases therefore they should be installed outdoors, under a roof, or in a room with good ventilation.
Generators need good airflow to ensure they do not over heat, if under roof or in a room make sure the roof is not too low and the area should be well ventilated.
Allow at least 1 meter on each side for access to the generator for servicing.
Position the generator as close to the distribution board as possible, this will cut installation and cable costs.
If you are considering a generator for home you might consider a silent generator. This will limit noise to your neighbours and occupants of the house. We consider a silent generator essential for home use.