The phrase "a narrow class of" is correct and usable in written English.
It can be used to refer to a specific, limited group within a broader category.
Example: "The study focused on a narrow class of species that are particularly vulnerable to climate change."
Alternatives: "a limited category of" or "a specific group of".
Our system allows immigrants to bring over only a narrow class of relatives.
There are already sanctions for putting out a narrow class of information: intelligence information, nuclear weapons data, identity of covert operations.
One of the accusations most often levelled at the Guardian by commenters below the line is that it hires from a narrow class of people.
Justice Thomas proposed adopting "a reading of the confrontation clause that respects its historically limited application to a narrow class of statements bearing indicia of solemnity".
It appears that solution of the electroneutral equilibrium represents a narrow class of solutions and is true only for certain relations between the parameters of the problem.
Each action taken by the Department of Justice, as well as the war crimes commissions considered by the president and the Department of Defense, is carefully drawn to target a narrow class of individuals -- terrorists.
In October, a judge in Dade County, Fla., gave permission to tobacco-liability plaintiffs to sue as a narrower class of smokers who are both addicted to nicotine and suffering from tobacco-related ailments.
Some privacy and transparency groups say that losing Section 215 would not cripple investigations, because the government would still have its predecessor — a pre-Patriot Act provision that would allow it to collect a narrower class of business records if they pertain to foreign powers or agents of foreign powers.
It created a very firm rule of actual confrontation for a narrowed class of covered hearsay, termed "testimonial statements," and created only a limited number of exceptions.
One aims at a narrower class of systems which is linear in parameters; however, it can cover many commonly found biological systems.
"This really ends up as a very narrow class of students," said Seth M. Galanter, who wrote a brief for New York Lawyers for the Public Interest in support of Mr. Freston.
