Involved in nucleotide excision repair of DNA damaged with UV light, bulky adducts, or cross-linking agents. Along with RAD10 forms an endonuclease that specifically degrades single-stranded DNA. Component of the nucleotide excision repair factor 1 (NEF1) complex consisting of RAD1, RAD10 and RAD14. Interacts with SAW1. Present with 1400 molecules/cell in log phase SD medium. Belongs to the XPF family.