If you're not sure which to choose call 01892-600121 for advice
If you are replacing an existing window fan please check to see that the hole size is appropriate for the model of fan you are considering. Normally this is a diameter between 108 - 118mm and will fit glazing between 4mm to 28mm thick.
If it is a new installation you will need to consult a glazier with the specification and ask about having a new pane of glass made and installed. In both cases you will need to consult a qualified electrician to undertake the electrical connections.
Fan installation in windows is a common feature and there are a number of things to bear in mind in order for it to be a success. If your unsure on which fan you need please see the ventilation guide or call us on 01892 600121