In the case of fabrics described in paragraph (c) of Section 1272, the manufacturer (or jobber) shall submit to the office of the State Fire Marshal a sample of his product not less than two yards in length or, if intended for exterior use, five yards long. Test reports from independent commercial testing laboratories may be required to substantiate claims made for such product. The State Fire Marshal may then perform, in addition to the fire resistance test, such tests as he may deem necessary to decide whether or not the product warrants registration.