The phrase "a closed room for" is correct and usable in written English.
It can be used to describe a room that is not open to the public or is restricted for a specific purpose.
Example: "The meeting will take place in a closed room for confidential discussions."
Alternatives: "a private room for" or "a restricted area for".
And so, futures are still decided by how well each child performs at a cramped desk in a closed room for two days in early June.
The four devices were simultaneously exposed to a mean radon concentration of 860 ± 60 Bq m−3 inside a closed room for periods of one, two and three months.
If we'd gone into a closed room for the argument, like parents afraid to argue in front of the children, it would have attracted more attention and created more concern".
"In this so-called 'art exhibition', butterflies are forced to exist in the artificial environment of a closed room for their entire lives.
The leaders of the legislature hired consultants who worked in a closed room for four months, generating map after map after map, trying to see how much more aggressive they could be in terms of giving the Republicans more seats and securing that advantage over the course of a decade.
After the 90-minute first act he invites the audience for a snack -- fruit, cheese, cookies, hard-boiled eggs -- and then asks everyone to follow him up another flight of stairs for the second act, which is performed in a closed room, empty but for the actors sitting on a couch and, a few feet in front of them, tightly packed wooden chairs for the audience.
The flask was placed on a rotary shaker in a dark, closed room for two weeks at room temperature.
And sex hovers around, like the atmosphere in a closed room after the act, for the rest of the book: "and when I felt her little hand trembling as it slid under my shirt, become a finch that has flown from a nearby thicket to nest in my chest hairs... .. Well, if that doesn't start doing it for you, then that's a shame.
But the adult-to-child ratio that works in a closed room is too low for public spaces where children may trip over museum artifacts or stick their hands in monkey cages.
The Computer Center included a room full of keypunch machines; a common area with an IBM "line printer" fitted with cheap, large-format paper; and a closed room where the operators could fit a printer for special jobs.
Second, the M4 is a particularly clumsy weapon for a police officer to use in a closed room at short range.
