N.H. Code Admin. R. Saf-C 1611.05
Indoor storage facilities constructed with metal shall have sides, bottoms, and covers or doors constructed of number 12 gauge metal and shall be lined inside with a non-sparking material. The edges of the metal covers shall overlap the sides by at least one inch.
Source. #6054, eff 7-1-95, EXPIRED: 7-1-03 New. #8116, INTERIM, eff 7-14-04, EXPIRES: 1-10-05; ss by #8231, eff 12-20-04; ss by #10396, eff 8-15-13