Thank you for your question.
Unless one or both of the fax machines in question are very old
technology, there should be an easy way to do this. In MOST cases, the
sending fax machine does not need to know nor have a setting for the
size of the page being transmitted. You can send anything from roughly
3x5" to legal and longer without changing any setting on your machine.
The receiving machine will need to be configured properly to receive a
larger than letter sized fax, however.
As mentioned on BellZinc.ca:
"...Paper handling. If you receive many legal-size documents, make
sure your fax machine can handle legal-size paper. Some models offer
two cassettes - one letter and one legal - and automatically use the
right cassette for an incoming document..."
"...The paper cassette on most plain paper fax machines is adjustable
to accommodate either letter size or legal size paper. If you load
legal size paper in the machine, you'll have to change a programming
parameter in machine so it knows legal size paper is loaded.
Commercial grade facsimile equipment can often be equipped with an
optional second paper cassette. If the machine is loaded with letter
size paper, and programmed accordingly, and it receives a legal size
fax, the image will automatically be reduced to fit on letter size
And modern HP machines include the following features:
"... Many different paper size choices for faxing and copying - from
3 x 5 to legal size - plus automatic conversion of legal size faxes to
letter size for incoming faxes..."
So, unless the receiving fax is an older model, the odds are it will
either have a separate cassette for legal sized paper or automatically
scale the legal fax down to letter sized. Since this is in a law
office, I would be VERY surprised if they were not set up to
automatically handle legal sized documents.
Now, just in case YOUR fax machine is a combination fax, scanner,
printer type office machine, you MAY have to set a menu item if you
use the flat glass table to place your document for faxing. This
Brother page notes this for some of their models, for example:
"...You can use the scanner glass to fax pages of a book or one page
at a time. The originals can be up to legal size (14 inches/ 356 mm).
If it is not illuminated in green, press "Fax".
- If your MFC machine has MODE key.
Press "Menu" or "Menu/Set".
Select Fax, and then press "Set" or "Menu/Set"*.
Select Setup Send, and then press "Set" or "Menu/Set"*.
Select Glass Fax Size, and then press "Set" or "Menu/Set"*.
Select Legal to 14 inches (356mm), and then press "Set" or "Menu/Set"*..."
To summarize, I think you will find that most fax machines will
automatically send a fax of any length within their limits without
changing any settings. The receiving fax machine may and may not
require a setting change or a change of paper to print legal sized
faxes properly, but considering this is a law office, will most likely
be prepared to receive legal sized documents.
If you have a specific fax make and model you would like to know more
about, please post that information and I will be happy to see if an
instruction manual is available online to check for its particular
fax +"legal size" +receive
send legal size fax
send OR transmit +"legal size" +fax
I trust my research has provided you with the answer and confidence
that this should not be a problem for you to fax legal sized documents
to your lawyer. If a link above should fail to work or anything
require further explanation or research, please do post a Request for
Clarification prior to rating the answer and closing the question and
I will be pleased to assist further.