Queen size split box spring. The term nuc refers to a split or small colony that does not yet fill a standard 10 frame or 8 frame brood chamber. A queen size box spring would not fit up the stairs to a loft bedroom so we purchased this split box spring. Nucs generally are designated as 1 frame 2 frame etc with 3 frame being the minimum viable size if the temperatures are expected to approach freezing. Invest in comfortable restful sleep for your family with mattresses that suit individual sleeping styles and preferred levels of firmness.