5. a. Any person who engaged in the installation, improvement, repair or maintenance of medical gas piping for not less than three consecutive years preceding the enactment date of this act may acquire certification as provided in subsection a. of section 2 of this act if that person has met the requirements specified in paragraph (3) of subsection a. of section 2 of this act no later than two years following the enactment date of this act.
b. Any person who performed only brazing duties incidental to the installation, improvement, repair or maintenance of medical gas piping for not less than three consecutive years preceding the enactment date of this act may acquire certification as provided in subsection b. of section 2 of this act if that person has met the requirements specified in paragraph (3) of subsection b. of section 2 of this act no later than two years following the enactment date of this act.