HP.com has a web page that talks about the different ways you can send a fax from this product:
Faxing Overview
In general, the fax machine in the all-in-one product doesn't need a computer to work. It works just like a stand alone fax machine. You shouldn't have to scan anything in from the scanner in order to fax. Just put the sheet of paper you want to fax into the product's feeder and follow the fax instructions (see the link I posted above).
As long as the product has electric power and is connected to a phone jack, it should work out OK.
As far as legal papers, if you mean legal sized papers, it should work as long as the product supports the paper size you want to use. You can get that on the product specifications web page at HP.
Product Specifications
Once that page opens, go to the Faxing specifications and Paper specifications sections for the relevant details. Good luck.
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