Mastic Spark Modern Fires 91P - Manual (Page 22)

22 L100001 23
Restrictor
Disk
VERTICAL THROUGH-THE-ROOF APPLICATIONS — RIGID VENTING ONLY
This Gas Fireplace has been approved for,
• Vertical installations up to 50' (15m) in height. Up to a 10' (3m) horizontal vent run can be installed within the vent system
using a maximum of two 90° elbows. See Figure 25.
Figure 25- Support Straps for Horizontal Runs
VENT INSTALLATION
Figure 26 - Maximum Elbow Usage
• Up to two 45° elbows may be used within the
horizontal run. For each 45° elbow used on the
horizontal plane, the maximum horizontal length
must be reduced by 18" (450mm).
Example: Maximum horizontal length
No elbows = 10’ (3m)
1x45° elbows = 8.5’ (2.6m)
2x45° elbows = 7’ (2.1m)
• A minimum of an 8' (2.5m) vertical rise is
required if venting through the roof.
• Two sets of 45°elbows offsets may be used within
the vertical sections. From 0 to a maximum of 8'
(2.5 m) of vent pipe can be used between elbows.
See Figure 26.
• 91, 92 series fireplaces allow for offsets. This
application will require that you first determine the
roof pitch and use the appropriate starter kit.
• The maximum angular variation allowed in the
system is 270°. See Figure 26.
• The minimum height of the vent above the high-
est point of penetration through the roof is 2'
(610mm).
40' Maximum Height
8' Minimum Height 40' Maximum Height
8' Minimum Height
10'
Maximum
10'
Maximum
1
2
3
4
1
2
3
4
Support Straps
Every 3'
Support Straps
Every 3'
Example: Elbow 1 = 45°
Elbow 2 = 45°
Elbow 3 = 90°
Elbow 4 = 90°
Total Angular Variation = 270°
Support
Straps
Every
5'Vertical
Restrictor
Disk
Restrictor
Disk
Restrictor Disk
RESTRICTOR DISC
NOTE: The restrictor disc
included with the installation
instructions should be used
on vertically terminating
installations only.
Install the restrictor disc into
the flue collar of the appliance
with the bar horizontal.