Brother MFC-J4510DW review | Multi-function (mfd) Reviews | TechRadar:

"This new multifunction printer has a twist. Specifically, it has a 90-degree twist. Instead of feeding the paper through the printer in portrait mode, with the short edge emerging first, the Brother MFC-J4510DW turns it sideways so it prints in landscape orientation.
This offers several advantages over the more traditional setup. It can print on A3-sized (11 x 17-inch) paper by taking the page through the printer short end first. A3 pages have to be hand-fed, one at a time through the manual feed slot at the rear of the printer, so it's not suitable for heavy-volume A3 printing.
Instead, think of it as an A4 (US letter size) printer that can print the occasional A3 page.
Although it can handle A3, unlike its A3 stablemate the Brother MFC-J6910DW, it's no larger than most A4 printers."