Hi Derek
Thanks for your message.
The Perfect Fit blinds are able to be fitted to aluminium windows/doors however you still need to check for clearance as per our guide here – https://vimeo.com/452546762
The perfect fit frame sits proud by approximately 12mm from fitting flush against the window frame. In turn, this may prohibit some bi-fold door systems folding completely flat against one another. Customers still proceed with orders but this is just so you’re aware.
If you’d like to order a sample of the frame and bracket to see if they fit your doors, please find the link here – https://www.blindsbypost.co.uk/blind-parts/perfect-fit-blind-frame-with-bracket-sample-kit?