Vertical (Offset) Installation
Analyze the vent routing and determine the quan- tities of vent sections and number of elbows required. Refer to Vertical Vent Figures and Tables on page 14 and 15 to select the type of vertical installation desired. Vent sections are available in net lengths of 4-1/2" (114 mm), 10- 1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876
mm)and 46-1/2" (1181 mm). Refer to the Vent Section Length Chart on page 10 for an aid in
selecting length combinations. Elbows are avail- able in 90° and 45° configurations. Refer to Figure 21 on page 13 for the SV4.5E45 and SV4.5E90 elbow dimensional specifications.
Where required, a telescopic vent section (SV4.5LA) may be used to provide the installer with an option in installing in tight and confined spaces or where the vent run made up of fixed length pieces develops a joint in a undesirable location, or will not build up to the required length. The SV4.5LA Telescopic Vent Section has an effective length of from 1-1/2" (38 mm) to 7-1/2" (191 mm). The SV4.5LA is fitted with a locking inclined channel end (identical to a normal vent section component) and a plain end with 3 pilot holes. Slip the plain end over the locking channel end of a standard SV4.5 vent component the required distance and secure with three screws.
Maintain a minimum 1" (25 mm) clearance to combustiblematerialsforallverticalelements. Clearances for all horizontal elements are 3" (76 mm) on top, 1" (25 mm) on sides and 1" (25 mm) on the bottom.
A. Frame ceiling opening - Use a plumb line from the ceiling above the appliance to locate center of the vertical run. Cut and/or frame an opening, 10-1/2" x 10-1/2" (267mm x 267mm) inside dimensions, about this center mark (Figure 17 ).
10-1/2” Min. 
(267 mm)
10-1/2” Min.
(267 mm)
Figure 17
B. Attach vent components to appliance - Secure Vent SV4.5 direct vent system compo- nents are unitized concentric pipe compo- nents featuring positive twist lock connec- tions (see Figure 18 ).
All of the appliances covered in this document are fitted with collars having locking inclined channels. The dimpled end of the vent compo- nents fit over the appliance collar to create the positive twist lock connection.
First Vent
Component
Align the dimple (four places) with the opening of the locking incline channel on appliance collar. Twist vent component clockwise to engage and seal.
Dimple
Locking
Incline Channel
Appliance collar
Vent / Appliance Collar
Connection
Figure 18
Arrow | Align the dimple (four places) of the |
| upper vent section with the opening of |
| the locking incline channel on the |
| lower vent section. Twist vent |
| component clockwise to engage and |
| seal until arrow and dimple align. |
| Dimple | |
| Locking | |
| Incline Channel | |
| Connected | |
| Vent Sections | Arrow |
Arrow | Vent / Vent Section | |
| Connection | |
Figure 19
To attach a vent component to the appliance collar, align the dimpled end over the collar, adjusting the radial alignment until the four locking dimples are aligned with the inlet of the four inclined channels on the collar (refer to Figure 18 ). Push the vent component against the collar until it fully engages, then twist the component clockwise, running the dimples down and along the incline channels until they seat at the end of the channels. The unitized design of the Secure Vent compo- nents will engage and seal both the inner and outer pipe without the need for sealant or screws. If desired, a #6 x 1/2" screw may be used at the joint, but is not required as the pipe will securely lock when twisted.
Note: An elbow may also be attached to the appliance collar. Attach in the same manner as you would a vent section.
C. Attach vent components to each other - Other vent sections may be added to the previously installed section in accordance with the require- ments of the vertical vent figures and tables.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
To add another vent component to a length of vent run, align the dimpled end over the inclined channel end of the previously installed section, adjusting the radial alignment until the four locking dimples are aligned with the inlets of the four incline channels of the previous section.
Push the vent component against the previous section until it fully engages, then twist the component clockwise running the dimples down and along the incline channels until they seat at the end of the channels. This seating position is indicated by the alignment of the arrow and dimple as shown in Figure 19.
D. Install firestop/spacer at ceiling - When using Secure Vent, use SV4.5VF firestop/spacer at ceiling joists; when using Secure Flex, use SF4.5VF firestop/spacer. If there is living space above the ceiling level, the firestop/spacer must be installed on the bottom side of the ceiling. If attic space is above the ceiling, the firestop/ spacer must be installed on the top side of the joist. Route the vent sections through the framed opening and secure the firestop/spacer with 8d nails or other appropriate fasteners at each corner. Remember to maintain 1" (25 mm) clearance to combustibles, framing mem- bers, and attic or ceiling insulation when running vertical chimney sections. Attic insu- lation shield (96K94) may be used to obtain the required clearances indicated here. See installation accessories table on page 27.
E. Support the vertical vent run sections - Note - Proper venting support is very impor- tant. The weight of the vent must not be supported by the firplace in any degree.
Support the vertical portion of the venting system every 8 feet (2.4m) above the fireplace vent outlet.
Blocking |
Support Straps |
(Plumber’s tape) |
8 feet (2.4 m) |
Maximum |
1 inch |
(25.4 mm) |
minimum |
clearance to |
combustibles |
Figure 20
