Golden Blount LFP4218TV Linear Fireplace - Manual (Page 7)

Installing Chimney/vent System
Model LFP4218 is approved to be used with 8" B-Type Gas Vent. Under most conditions the fireplace
system will draw properly if the chimney height is determined in accordance with the following guidelines:
Note: (90-degree elbows are not approved! Maximum offset angle must not exceed 45 degrees.) Many
manufacturers of B-Type gas vent offer “High Performance,” or “High Wind” caps. These caps limit the outlet area
for flue gasses to expel and should not be used with this fireplace. In the event of draft related problems due to
extreme wind conditions a special wind ring is available.
1. If your chimney penetrates the roof within 10' of its peak, it must be extended at least 24" above your roof’s
peak and be at least 36" above the highest point of the roof opening, (see below).
2. If the chimney penetrates the roof farther than 10' from its peak, measure from the centerline of the chimney to
a point 10' away, between the chimney and the peak of the roof. The top of the chimney must be at least 36"
above the highest point of the roof opening, (see below).
3. The 10' Rule of Thumb is a guide for calculating chimney height that works under most conditions. However,
many factors can cause the need for additional chimney height beyond what 10' Rule of Thumb would indicate.
Topographical factors can cause high-pressure zones, which prevent a chimney from drawing. This can occur if
the house is located in a low-lying area, in a valley or near the base of a cliff or hillside. The same situation can
occur if the chimney is near other steep rooflines or tall buildings. Areas with high winds also frequently require
higher than normal chimneys.
Certain styles of architecture tend to interfere with a fireplace’s draw. If the room in which the fireplace is located
has a very high ceiling, smoke may enter the room unless the chimney is terminated at a level higher than that
of the ceiling, even if the 10' Rule of Thumb indicates a shorter chimney height.
Note: Installations which will not allow the 10' rule to be followed must be submitted to Golden Blount Inc. for
approval. 1-800-833-1139.
Warning! This gas appliance must not be connected to a chimney flue serving a separate solid-fuel
burning appliance.
Note: A draft hood is installed and is in the same atmospheric pressure zone as the combustion air inlet to the
appliance and is located so that the relief opening is accessible for checking vent operation.
7
MINIMUM
FRAMING
DIMENSIONS
52"
36"
24"
31"
23 1/2"
35"
6"
7"
18"
42"
51"
2.5"
6.5"
FRONT OF
APPLIANCE
FRONT VIEW
TOP VIEW
SIDE VIEW
OPENING
HEIGHT
HOLE FOR GAS LINE
UNIT DIMENSIONS FOR
CONSTRUCTION PLANNING
Figure 7.1
Installing Outside Air Kit
Model LFP4218 is supplied with the component parts for outside combustion with the exception of the 4"
flex duct. It is recommended that the outside air system be used whenever possible. Connect 4" Class-1
Flex duct or Metal Vent to duct collar on side of firebox, run duct to fresh air source and terminate using duct
termination cap. The Outside air can be opened by pulling control knob toward front of fireplace and
closed by pushing towards rear (Refer to figure 8.1).
10 1/2"
4"