The phrase "are set off from" is correct and usable in written English.
It can be used to describe something that is distinguished or separated from something else, often in a physical or metaphorical sense.
Example: "The flowers in the garden are set off from the rest of the landscape by their vibrant colors."
Alternatives: "are distinguished from" or "are separated from".
Assamese and Bengali are set off from Oriya.
The rooms where the birds are killed, eviscerated, wrapped and cut up are set off from one another.
SunGard also has a policy against identifying any tenant of its facilities, which are set off from downtown areas, and protected with armed guards -- inside and out.
Three circular booths are set off from the rest of the dining room on 48-inch raised platforms, allowing for both privacy and commanding views of Duet's "industrial chic" design.
The bedrooms are set off from the living space by three steps and a hallway with a round skylight (yet another feature of traditional Iranian architecture, which often does not have many windows, said Soheila Beski, the editor of Memar).
None of the many Indic terms for monk (e.g., the Sanskrit apabhramsha or the Pali prakrit) mean "single" or "living alone," though monastics in those traditions most notably Hinduism, Buddhism, and Jainism live alone or in groups that are set off from the rest of society.
Buses are setting off for little Cotswoldy village names, Podsmead and Lower Tuffley, which sing of oatmeal stone and village greens; and yet they are setting off from a bus station streaked mid-morning with fresh urine, and there's an undercover drugs operation centred on the cafe.
Three open top buses, carrying the players, management and staff of Argyle are setting off from Home Park, heading for a civic reception at the Council House at 18 20.
The campaigners are setting off from an East London wharf pulling a 10ft high duck house to dock at the Palace of Westminster while they claim MPs are busy plotting to overturn Sir Christopher Kelly's recommendations on claiming for mortgages and employing relatives.
In 1840 the Mead's Creek Baptist Church was set off from Hornby as a separate congregation.
