KFax honors the following key bindings when the pointer is place on an open fax document view.
h Show help page displaying the available keyboard-shortcuts
q Return to the original document.
n + Next PgDn Space Display the next page
p - Prior PgUp Backspace Display the previous page
Shift Home First Page
Shift End Last Page
u Turn Page upside down
l Turn page 90 degrees
m Show a mirror image of the current fax page
i zoom in
o zoom out