[Code of Federal Regulations]

[Title 46, Volume 4]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 46CFR116.610]



[Page 337-338]

 

                            TITLE 46_SHIPPING



                  (This book contains parts 90 to 139)

 

   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)

 

PART 116_CONSTRUCTION AND ARRANGEMENT--Table of Contents

 

                          Subpart F_Ventilation

 

Sec.  116.610  Ventilation ducts.



    (a) For the purposes of this section, a ventilation duct includes 

any type of piping, chamber, or conduit used for ventilation.

    (b) A ventilation duct, and materials incidental to its 

installation, must be made of noncombustible material.

    (c) Combustibles and other foreign materials are not allowed within 

ventilation ducts. However, metal piping and electrical wiring installed 

in a metal protective enclosure may be installed within ventilation 

ducts, provided that the piping or the wiring does not interfere with 

the operation of fire dampers. Electrical wiring and piping may not be 

installed in an exhaust duct over a frying vat or grill.

    (d) Suitable means, such as a manual damper, automatic damper, or 

vent cover, must be provided in an accessible location outside the space 

served by the ventilation duct for shutting off the passage of air 

through the ventilation duct in the event of fire.

    (e) A ventilation duct must not serve more than one main vertical 

zone; penetrations of main vertical zones must be minimized.

    (f) A ventilation duct penetrating an A-Class or B-Class fire 

control boundary must meet the following requirements:

    (1) A ventilation duct must meet the same requirements relative to 

the passage of smoke and flame as the fire control boundary penetrated;

    (2) A steel duct penetrating an A-Class fire control boundary must 

be of at least 11 USSG, and a steel duct penetrating a B-Class bulkhead 

or deck must be of at least 16 USSG;

    (3) A duct penetrating a main vertical zone bulkhead must be fitted 

with an automatic fire damper at the main vertical zone bulkhead;

    (4) A duct penetrating an A-Class fire control boundary and opening 

into a



[[Page 338]]



space formed by that boundary must be equipped with a fire damper;

    (5) A steel duct that penetrates an A-Class fire control boundary 

other than a main vertical zone bulkhead, and does not open within the 

space formed by the boundary need not be fitted with a fire damper 

provided the duct is at least 11 USSG throughout that space;

    (6) A duct penetrating an insulated fire control boundary must be 

fitted with insulation of the same type and thickness as the boundary 

penetrated for a distance of at least 305 millimeters (12 inches) on the 

insulated side of the boundary. A fire damper blade need not be 

insulated; and

    (7) Ducts serving cargo spaces, machinery spaces, or vehicles spaces 

must be fitted with automatic fire dampers.

    (g) Fire dampers, where required by this section, must comply with 

the following requirements;

    (1) A fire damper and casing must be at least 11 USSG and not more 

than 3.2 millimeters (0.125 inch) gap between the blade and casing;

    (2) A fire damper must close against the draft in the duct and be 

accessible for periodic inspection by means of a hinged or bolted plate 

in the duct and surrounding bulkhead or deck, if fitted;

    (3) Fire damper springs, blades, and hinges must be of stainless 

steel construction or of steel suitably coated to prevent corrosion;

    (4) Fire dampers must be capable of manual operation from outside 

the space served, be fitted with an indicator showing whether the damper 

is open or closed, and be marked with red letters of at least 12.7 

millimeters (0.5 inches) in height stating ``VENTILATION FIRE DAMPER''; 

and

    (5) An automatic fire damper must meet the above requirements and 

must be designed to operate at 74[deg]C (165[deg]F) for normal locations 

and approximately 100[deg]C (212[deg]F) for locations such as galleys.

    (h) A ventilation duct serving a stairtower must not serve another 

space.



[CGD 85-080, 61 FR 900, Jan. 10, 1996, as amended at 62 FR 51350, Sept. 

30, 1997]