You are talking about the fan that is on the floor of the compartment, down in a well, aimed down, and with the dryer hose fitted over it, right? In my TM, this fan is not fastened down, but seems to be held loosely in place by the dryer hose and some kind of rather crude sheet-metal spacer that is at the bottom of the well.
I doubt that it makes any difference how you hold it down, as long as it remains more-or-less centered over the screened opening, and the dryer hose fits it reasonably snugly. Given those things, nothing in this area is critical.
Bill
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