Set size rule for folder or volume to send email

I want to use Hazel to send me an email when a folder (or volume) exceeds a size in GB.
I have a email Applescript that runs fine.
The rule is:
KInd is Folder
Size is greater than 18 GB
Do the following to the matched file or folder
Run Applescript Embedded Script (The send email script that I know works)
This setup fails because it seems Hazel INSISTS on applying the rule to all sub-folders inside the selected folder (there are 3 subfolders). If each of these subfolders is bigger than 18 GB, then yes the email gets sent. BUT this is not the behaviour I require and I have not set any option to apply the rule to subfolders.
I simply want Hazel to apply the rule to the PARENT folder only and not to apply it to CHILD folders inside the parent.
The same problem occurs if I set Kind to Volume. The Size rule only works if all the folders inside the volume satisfy the rule condition.
I cannot see what setting I am doing wrong, or is this a bug?
OS X 10.11.2
Hazel 3.3.6
I have a email Applescript that runs fine.
The rule is:
KInd is Folder
Size is greater than 18 GB
Do the following to the matched file or folder
Run Applescript Embedded Script (The send email script that I know works)
This setup fails because it seems Hazel INSISTS on applying the rule to all sub-folders inside the selected folder (there are 3 subfolders). If each of these subfolders is bigger than 18 GB, then yes the email gets sent. BUT this is not the behaviour I require and I have not set any option to apply the rule to subfolders.
I simply want Hazel to apply the rule to the PARENT folder only and not to apply it to CHILD folders inside the parent.
The same problem occurs if I set Kind to Volume. The Size rule only works if all the folders inside the volume satisfy the rule condition.
I cannot see what setting I am doing wrong, or is this a bug?
OS X 10.11.2
Hazel 3.3.6