A dedicated unit to treat cystic fibrosis (CF) patients has been described as a tribute to campaigners who died before it was built.
Patients will be moved into the specialised facility, which is part of the new Nutley wing in St Vincent's University Hospital (SVUH) in south Dublin.
The unit has 34 inpatient rooms, with ensuite facilities, an exercise facility, a computer console and TV, and a further 10 CF day-care rooms.
Philip Watt, of the Cystic Fibrosis Association of Ireland (CFAI), said it would be an emotional day and a tribute to campaigners, including Anita Slowey who died last year at the age of 24.
"This has been 12 years of campaigning and much heartache," he said.
"It is a tribute to all of the people with CF, particularly to those who have been dedicated to this campaign like Anita Slowey, who is no longer with is, and Orla Tinsley and Jillian McNulty.
"It cannot be understated the huge impact the patients themselves made.
"It was the first time the general public knew what CF meant and why the facilities were so badly needed."
CF is an inherited disease that primarily affects the lungs and the digestive system.
Ireland has the highest proportion of patients in the world, with one in 19 people said to carry one copy of the altered gene that causes it.