N.H. Rev. Stat. Ann. § 228:43

The commissioner may authorize the destruction of papers or records not having a permanent or historical value at the end of 7 years from the making thereof; provided, however, that the rules and regulations of the director of the division of archives and records management, as promulgated under RSA 5:40, may provide that designated papers or records may be destroyed at an earlier period or require their retention for a longer period.