Fixed windows are best choice to allow light in and give a view but need not to be opened or operated because there are no ventilation possibilities. The fact that fixed windows don't operate does not means that the design or quality can be compromised in anyway.
Additional accuracy in installation and design expertise during fabrication is needed to assure that fixed windows remain sanitary and serve their purpose well. upvc fixed windows are a perfect choice in these situations because of their less maintenance requirments and great strength and endurance.
Easy to drill and nail.
Shield against sound pollution
Occupy little space
Superior protection against weather and water corrosion