Which hairdryer can I use the air diffuser with? September 23, 2019 09:17 Updated The diffuser can only be used with the ghd air® hairdryer. Unfortunately, this will not work with the ghd flight®. Related articles ghd air® hair dryer What is the difference between the ghd hair dryers? What is the wattage of the ghd hairdryers? How do I claim on my warranty? There is a hole in my paddle brush and what is this for?