RNA-binding protein required for the maturation of box H/ACA snoRNPs complex and ribosome biogenesis. During assembly of the H/ACA snoRNPs complex, it associates with the complex and disappears during maturation of the complex and is replaced by NOLA1/GAR1 to yield mature H/ACA snoRNPs complex. Probably competes with NOLA1/GAR1 for binding with DKC1/NOLA4. During assembly of the complex, component of the small nucleolar ribonucleoprotein particles containing H/ACA-type snoRNAs (H/ACA snoRNPs) which contains NOLA2/NHP2, NOLA3/NOP10, NAF1 and DKC1/NOLA4. Interacts directly with DKC1/NOLA4. Shuttles between the cytoplasm and the nucleus. Absent from the nucleolus (By similarity). Belongs to the NAF1 family.