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vENTiNG iNSTALLATioN
iNSTRUcTioNS
Continued
2. Direct vent pipe sections and components are designed with
special twist-lock connections.
twist-Lock Procedure:
locking lugs (indentations). These lugs will slide straight into
matching slots on the male ends of adjacent pipes. Push pipe
sections together and twist one section clockwise approxi-
mately one-quarter turn until the sections are fully locked (see
Figure 8). Note: Horizontal runs of vent must be supported
every three feet. Use wall straps for this purpose.
3. Use a 45° elbow to connect venting system to fireplace flue
collar. The elbow is designed to be twist-locked onto the flue
collar as described in step 2. IMPORTANT: Do not attempt
to alter the configuration of the elbow by cutting, twisting,
bending, etc.
4. Assemble the desired combination of pipe and elbows to the
fireplace. If there are long portions of venting run, pre-as-
sembled pipe sections may be installed as subassemblies for
convenience.
5. Carefully determine the location where the vent pipe assembly
will penetrate the outside wall. The center of the hole should
line up with the center-line of the horizontal vent pipe. Mark the
wall for a 10
/
" x 10
3
3
4
hole in the exterior wall where the vent will be terminated. If
the wall being penetrated is constructed of noncombustible
material, such as masonry block or concrete, a 8
zero clearance is acceptable (see Figure 9).
WARNING: Do not recess vent termination into any
wall. this will cause a fire hazard.
6.
Noncombustible Exterior Wall:
cap in the center of the 8
exterior wall with four wood screws provided. Before attach-
ing the vent cap to exterior wall, run a bead of non-hardening
mastic (pliable sealant) around the outside edges to make a seal
between it and the outside wall. Note: The four wood screws
provided should be replaced with appropriate fasteners for
stucco, brick, concrete, or other types of sidings.
Combustible Exterior Wall:
exteriors, a siding standoff must be installed between the vent
cap and exterior wall. The siding standoff prevents excessive
heat from damaging the siding materials. Siding material
must be cut to accommodate standoff. Bolt the vent cap to the
standoff. Apply non-hardening mastic around outside edge of
standoff. Position the standoff/cap assembly in the center of
the 10
/
" square hole and attach to exterior wall with wood
3
4
screws provided (see Figure 11, page 9). The siding standoff
must sit flush against the exterior fascia material.
8
The female ends of the pipes have
/
" square hole. Cut and frame the square
4
Position the horizontal vent
/
" round hole and attach to the
1
2
For vinyl siding, stucco, or wood
Vent Opening
Combustible Wall
3
10
/
"
4
(27.3 cm)
Vent Opening
Noncombustible Wall
1
8
/
"
2
(21.6 cm)
/
" hole with
1
2
www.desatech.com
Female
Locking Lugs
Figure 8 - Vent Pipe Connections
3
10
/
" Inside Framing
4
3
(27.3 cm)
10
/
"
4
(27.3 cm)
(Framing
Detail)
Figure 9 - Vent Opening Requirements
Figure 10 - Installing Horizontal Vent Cap
Male
Slots
Center
of Hole
Apply Mastic to
All Four Sides
Vent Cap
Wood Screw
108862-01E
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