Installation Instructions

CONCEALED FITTINGS LOCATION
The Pro-Flex
®
Mechanical Fittings have been tested and listed per the requirements of ANSI/CSA LC-1
for concealed use. The fitting may be used for concealed attachment to appliance valves, branch runs
using tee fittings, and length splices.
These guidelines address some of the most common situations where concealing the fittings is the only
practical alternative. These guidelines cannot address all applications of concealed fittings, but instead,
provide typical instructions to demonstrate the principles that apply to fittings listed for installation in
concealed locations. (reference National Fuel Gas Code, NFPA 54, Section 3.4.2)
a) New Installations - When multiple gas outlets are supplied from a single run of CSST,
each downstream outlet branch can be connected to the main run using a tee-type
fitting which can be located in a concealed location.
b) Fireplace "key valves" - Flexible piping connections to fireplace key valves can be
located in a concealed location, when accessibility is not readily provided.
c) Exclusion - Manifold stations (2 PSI system), which include the multi-port manifold,
shut-off valve and pressure regulator, shall not be installed in concealed locations
regardless of the qualifications of the tubing.
Modifications to Existing Systems
a) New Ceilings in Unfinished Rooms/Basements - CSST fittings originally installed in
accessible ceiling locations can be concealed in the event a ceiling is installed at a later
date.
b) Extensions to Existing Tubing Runs -
A concealed tubing can be modified
to permit an extension to another
appliance location provided there is
sufficient capacity to supply both
appliances at the same time. If an
accessible location for the modifica-
tion is not available, the existing tub-
ing run can be modified with a tee fit-
ting which will result in a concealed
fitting behind the wallboard.
c) Repairs to Existing Tubing Runs - Damaged tubing runs shall be repaired in accordance
with the instructions in this guide. The repair can result in a line splice that may ultimate-
ly be located in a concealed location.
d) Concealed tubing shall be protected from puncture threats, using the shielding devices
specified by the manufacturer, at all points of penetration through studs, joists, plates or
similar structures. The extent of protection shall be defined as follows:
21
1. At points of penetration less than 2 in (50.8 mm) from any edge of a stud, joist,
plate, etc., a listed striker plate is required to provide protection at the area of sup-
port and within 5 in (127 mm) of each side (if appropriate) of the support.
2. At points of penetration 2 to 3 in (50.8 mm to 76.2 mm) from any edge of a stud,
joist, plates, etc., a listed striker plate is required to provide protection throughout the
area of support.
3. At points of penetration greater than 3 in (76.2 mm) from any edge of a stud, joist,
plate, etc., no protection is required.
4. Tubing routed horizontally through studs shall be protected from puncture threats
between the studs using the shielding devices provided.
5. CSST greater than 1-in (25.4 mm) inside diameter installed within hollow cavity walls
of 2” x 4” construction shall be protected along the entire concealed length in the
manner and using the shielding devices specified by the manufacturer.
6. The width of the installed striker plate, at the points of penetration through w
all
studs, floor joists, plates, sills, etc., shall be out at least 1.5 times the outside diame-
ter of the tubing.
248008 17498_TF_TrainingG.indd 25248008 17498_TF_TrainingG.indd 25 6/12/13 12:16 PM6/12/13 12:16 PM