Monessen Hearth Direct Vent BLDV400 - Manual (Page 20)

20 74D0009
40' Maximum Height
8' Minimum Height
10'
Maximum
Support Straps
Every 3'
VERTICAL (THROUGH-THE-ROOF) APPLICA-
TIONS
This Gas Fireplace has been approved for,
• Vertical installations up to 40' (12m) 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
18.
Figure 18 - Support Straps for
Horizontal Runs
VENT INSTALLATION
Figure 19 - 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.
• 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 19.
• The maximum angular variation allowed in the system is
270°. See Figure 19.
• The minimum height of the vent above the highest point
of penetration through the roof is 2' (610mm).
1
2
3
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
NOTE: Horizontal sections of this vent system require
a minimum of 3" clearances to combustibles at the top
of the fl ue and 1" clearance at the sides and bottom
until the fl ue penetrates the outside wall. A minimum
1" clearance all around the fl ue is acceptable at this
point of penetration.
Vertical sections of this vent system require a
minimum of 1" clearance to combustibles on all sides
of the pipe.
12"
12"