Installation
900414-00 12/2015
Innovative Hearth Products
MHD 35/40 Series Direct-Vent Gas Fireplaces
25
Ensure clearances are in accordance with local installation codes and the requirements of the gas supplier.
Dégagement conforme aux codes d’installa tion locaux et aux exigences du foumisseunde gaz.
Vertical vent systems terminate through the roof. The minimum vent height above the roof and/or adjacent walls
is specified in ANSI Z223.1 (In Canada, the current CAN/CGA-B149.1 installation code) by major building codes.
Always consult your local codes for specific requirements. A general guide to follow is the gas vent rule (
Table 6
).
The following figures and their associated vertical vent tables illustrate the various configurations that are possible
for use with these fireplaces. Secure Vent
®
pipe is shown in these figures; Secure Flex
®
pipe may also be used.
A table summarizes each configuration’s minimum and maximum vertical and horizontal length parameters for a
variety of applications.
1.
Refer to
Figure 28
and
Tables 16
–
19
on
Pages 28–29
to select the type of vertical installation desired. Elbows
are available in 90° and 45° configurations. Refer to
Figure 17
on
Page 22
for the SV4.5E45 and SV4.5E90
elbow dimensional specifications.
Vertical (Straight) Installation
1. Determine the number of straight vent sections required
—See
Effective Vent Length on
Page 22
for more
information. Plan the vent lengths so that a joint does not occur at the intersection of ceiling or roof joists.
Figure 20 - Vertical (Straight) Installation
SV4.5FA or
SV4.5FB Flashing
AND SV4.5SC
Storm Collar
SV4.5VF
Firestop/Spacer*
1” (25.4 mm)
Minimum
Clearance to
Combustibles
SV4.5CGV-1
Termination
SV4.5L6/12/24/36/48
Vent Sections
*When using
Secure Flex
,
use Firestop/Spacer
SF4.5VF
.
Max. 60 ft
(18.3 m)
Vertical (Offset) Installation
1. Analyze the vent route and determine the number of vent sections and elbows required
—See
Effective Vent
Length on
Page 22
for more information. Plan the venting so that a joint does not occur in the ceiling or roof
joists. Allow for elbows
(
Figure 17, Page 22
)
. Maintain the minimum clearances for combustibles
(
Page 24
)
.
2. Frame the ceiling opening
—Use a plumb line from the ceiling above the fireplace to locate the center of the
vertical run. Cut and/or frame an opening, 10-1/2 x 10-1/2” (267 x 267 mm) inside dimensions, about this center
mark
(
Figure 23, Page 26
)
.
*or H3907 for
space with
attic above the
ceiling
