Yes, they're removable unless there has been a change in the tooling within the past few years. Stewart F's are now marketed by Bowser, and Bowser probably has the parts. I did some of this swapping several years ago when I changed some F3's from high fans to low. However, I think the DB fans/grilles are molded in.
Tom
Are the cooling fans removable between the Stewart F-units? I want to install the tall F-3 style fans on an F-7. I'm hoping they are a removable piece rather than having to cut and file.
Thanks,
Roger Huber