Are continuous (also known as piano hinges) permitted on fire doors? Yes they are! New to the 2013 edition of NFPA 80, Section 188.8.131.52, which addresses hinges, is now inclusive of hinges, spring hinges, continuous hinges and pivots.
Prior to 2013, NFPA 80 did not necessarilty prohibit the use of this hardware, rather it was silent on the issue, thus causing confusion to users as to whether or not these types of hinges were recognized by the standard. The Technical Committee accepted a proposed change to add continuous hinges to Section 184.108.40.206 so that it was clear that they are recognized and permitted to be used on fire doors if installed properly and in accordance with the standard.
Section 220.127.116.11.6 and 18.104.22.168.7 are also new sections specific to continuous hinges and state the following:
22.214.171.124.6 The length of continuous hinges shall be within 1 in. (25 mm) of the height of the door leaves.
126.96.36.199.7 Continuous hinges shall be labeled and shall meet the requirements of ANSI/BHMA A156.26, American National Standard for Continuous Hinges.
*You may view the current edition of NFPA 80 (and all NFPA documents!) free online by visiting the Document Information Page for NFPA 80 (shortcut www.nfpa.org/80) where you will find a link to view the current edition.