Fire incident at the Milimani secondary school has caused four students to be admitted in the hospital on Tuesday morning.
The school is near Nairobi Primary along State House Road.
The cause of the fire is yet to be established but officials say it started at one of the dorms burning a section of it.
The students inhaled smoke that chocked them but they are in stable condition.
Fire engines from the county government rushed to the scene and managed to contain the spread.
The affected students have been moved to a different dormitory.