The phrase "are exactly designed" is correct and usable in written English.
It can be used when describing something that has been specifically created or tailored for a particular purpose or function.
Example: "The new software features are exactly designed to enhance user experience and streamline workflow."
Alternatives: "are specifically crafted" or "are precisely intended".
"It's not helpful to say that the dominant interpretive principle is to reinforce majority rule when a number of the most controversial constitutional doctrines, like abortion, are exactly designed to limit and counteract majority rule".
Usually, HVAC plants are exactly designed in order to guarantee comfortable internal conditions inside built environments, but not all kind of buildings are equipped with a heating or cooling plant, like for example, some industrial buildings.
"We'd set up a test where we'd revealed the rules so clearly to the manufacturers that they were designing cars which were exactly designed to mimic those tests and perform against those test.
One of the biggest issues with most watches/activity trackers is that they aren't exactly designed for underwater use.
The one drawback is that the software is missing a recording function, but then again, the Eee isn't exactly designed to be a media center, so that probably won't be much of an issue.
But what they're doing is of great interest, given that AAA games aren't exactly designed with them in mind.
Most flash drives have a lanyard thing but the drives themselves aren't exactly designed for keychains.
Some shampoos like Suave or VO5 or Garnier Fructis aren't exactly designed for our hair or don't have enough moisturizing ingredients.
That wasn't exactly designed to suggest he had been riveted with high speed action for 90 minutes, and I haven't returned to watch the second half.
Her horse Rafalca competing in the Olympics dressage events was not too great a liability, but the situation wasn't exactly designed to win over undecided voters either.
