ASC FLEXHEAD Instruction Manual

Installation and Maintenance for
WARNING!
These installation instructions are for qualified and experienced technicians in the H.V.A.C.
and Fire Protection field only. Failure to follow these specific instructions may cause personal
injury. Installation or maintenance technicians must read the entire manual prior to
attempting installation or maintenance of product.
Stainless Steel and
Galvanized Ductwork Model
Stainless Steel and Galvanized Ductwork Model Installation and Maintenance Manual – 35
Installation should take approximately 10-20 minutes per head. (Not Including cure time.)
Retain these instructions for future use.
Tools Required
Right Angle Drill
2” Metal Holesaw
3/8” Drill
3/16” Metal Drill Bit
Torque Wrench (1-50 inch-lbs.)
Safety Glasses
Particle Mask
Vinyl Gloves
Duct Tape
Clean Rags
Safety Face Shield
Permanent Magic Marker
Large Rivet Gun (3/16” Capability)
Materials Required
Duct Sealant
3/16” Stainless Steel Pop Rivets (4 per each FlexHead unit)

1FlexHead Location
Determine desirable location for FLEXHEAD
unit in ductwork. FLEXHEAD unit must be
accessible for periodic inspection. For
recommended guidelines and standards for
protection systems in industrial exhaust
systems see Factory Mutual loss prevention
data sheets 7-78, article 2-4. Once desired
location is determined drill a two (2) inch hole
in duct with holesaw (Fig. 1s).
2Mounting Bottom Block
A. Place Flexhead bottom mounting block
on duct. Align 2” hole in ductwork with 1 7/8”
hole on FLEXHEAD bottom block. Place a
permanent marker in the (4) four pre-punched
holes and mark (Fig. 2s). Make sure that the 2”
hole in ductwork with 2” hole on FLEXHEAD
bottom block are aligned exactly and that the
bottom flange of mounting block fits securely
to the duct with out gaps.
B. Remove bottom mounting block from
ductwork. Using a 3/16” drill bit, carefully drill
out the (4) four holes marked out in step 2A.
C. Apply a 1/4” bead of duct sealant around 2”
hole in duct. Apply a 1/4” bead of sealant
around the 2” hole in bottom mounting block
(Figs. 3s and 4s).
D. Place Flexhead bottom mounting block onto
ductwork. Make sure that the 2” hole in
ductwork with 2” hole on FLEXHEAD bottom
block are aligned exactly and that the bottom
flange of mounting block fits securely to the
PART I – INSTALLATION OF BOTTOM MOUNTING BLOCK
Stainless Steel and Galvanized Ductwork Model Installation and Maintenance Manual – 36
CAUTION!
Safety glasses, vinyl gloves and particle mask must be worn by installing technician during
FLEXHEAD Stainless Steel and Galvanized Ductwork Model installation.
Fig. 1s
Fig. 2s
Fig. 3s

duct with out gaps. Next, make sure that the (4)
four pre-punched holes in the bottom
mounting block and the (4) holes drilled in step
2A align perfectly. Insert a 3/16” stainless steel
pop rivet into each of the (4) four holes and
rivet into place with the pop rivet gun.
E. Apply a duct sealant around the entire outer
edge of the bottom mounting block and on
each of the (4) rivets (Fig. 5s). The installation of
the bottom mounting block is complete.
F. Insert bag/gasket assembly over bolt holes
making sure dual polybags protrude through 2
inch hole in bottom mounting block.
Stainless Steel and Galvanized Ductwork Model Installation and Maintenance Manual – 37
Fig. 4s
Fig. 5s

Stainless Steel and Galvanized Ductwork Model Installation and Maintenance Manual – 38
PART II – INSTALLATION OF TOP MOUNTING BLOCK
1Connect FlexHead to Sprinkler System
Connect one (1) inch stainless steel flexible
hose of FLEXHEAD to one (1) inch black iron
pipe union of fire protection system in
accordance to NFPA standards, state and local
codes (Fig. 6s).
2Connect to Top Mounting Block
A. Place top FLEXHEAD mounting block
onto previously installed bottom mounting
block with gasket making sure that sprinkler
head section of the FLEXHEAD unit is inserted
into two (2) inch hole in duct, and that the
four (4) stainless steel bolts of bottom
mounting block align with corresponding bolt
holes in top mounting block. Angle of flexible
hose should not exceed 90˚.
B. Place one (1) stainless steel washer and one
(1) stainless steel nut onto each of the four (4)
stainless steel bolts (Fig. 7s). Tighten each of
the nuts hand tight onto the block. Tightening
process of nuts onto the mounting block
should be done in a diagonal process to ensure
equal distribution of pressure throughout the
mounting block. Nuts should be tightened to
15 in. -lb. using a torque wrench. DO NOT
OVER TIGHTEN NUTS ONTO BLOCK. Installation
of FLEXHEAD is complete.
Fig. 6s
Fig. 7s

Stainless Steel and Galvanized Ductwork Model Installation and Maintenance Manual – 39
CAUTION!
Safety face shield, vinyl gloves and particle mask must be worn by maintenance
technicians during FLEXHEAD maintenance.
CAUTION!
During installation of FLEXHEAD product fire protection system must be fully drained
and the exhaust system shut down. Do not attempt FLEXHEAD installation when either system
is operational. Consult NFPA Guidelines for details.
MAINTENANCE AND INSPECTION OF STAINLESS STEEL AND GALVANIZED
DUCTWORK MODEL SPRINKLER HEAD
Fig. 8s
1Once fire protection and exhaust system
are inactive, proceed with inspection of
FLEXHEAD unit.
2Remove the four (4) stainless steel nuts
and washers from top mounting block.
3Now lift top mounting block from bottom
mounting block and bolts, by holding onto
base area of stainless steel hose (Fig. 8s).
4Inspect sprinkler head and poly bag
section of FLEXHEAD. If damage exists in
outer poly bag only, replace bag/gasket
assembly at this time. If damage exists through
both poly bags remove remainders of
bag/gasket assembly and inspect wax coated
sprinkler head. IF ANY DAMAGE EXISTS IN
SPRINKLER HEAD REPLACE HEAD AND BOTH
POLY BAGS AT THIS TIME in accordance to
NFPA regulations and guidelines.
5Once inspection and maintenance of
FLEXHEAD has been completed, reinsert
top mounting block onto bottom block aligning
corresponding sprinkler head and bolt holes.

6Replace the four (4) stainless steel washers
and nuts onto the four (4) stainless steel
bolts accordingly. Hand tighten each of the (4)
nuts onto the block. The tightening sequence of
nuts onto the mounting block should be done
in a diagonal manner to ensure equal distribu-
tion of pressure throughout the mounting
block. Nuts should be tightened to 15 in. -lb.
using a torque wrench. DO NOT OVER TIGHTEN
NUTS ONTO BLOCK. MAINTENANCE OF FLEX-
HEAD IS COMPLETE. (Same tightening process
as in Installation section).
Stainless Steel and Galvanized Ductwork Model Installation and Maintenance Manual – 40