1
FlexHead 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).
2
Mounting 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
