Installation
900005-00, 10/2015
Innovative Hearth Products
Envy™ Direct-Vent Gas Fireplaces
19
• A pipe joint compound rated for gas should be used on the threaded joints. Ensure propane-resistant
compounds are used in propane applications. Be very careful that the pipe compound does not get inside the
pipe.
• A sediment trap in the supply line as close as possible to the fireplace is recommended.
• Check with the local building official for local code requirements (e.g., Are below grade penetrations of the gas
line allowed?, etc).
Table 12 - Schedule 40 Black Iron Pipe, Inside Diameter
Pipe Length
Natural Gas
Propane Gas
0–10 ft
1/2”
3/8”
10–40 ft
1/2”
1/2”
40–100 ft
1/2”
1/2”
100–150 ft
3/4”
1/2”
150–200 ft
3/4”
1/2”
CAUTION
If propane is used, be aware that with a tank that is too small (i.e., under 100 lbs, if this
is the only gas appliance in the dwelling—see NPFA 58), there may be a loss of pressure.
This can result in insufficient fuel delivery that can cause sooting, delayed ignition, or other
malfunctions. Any damage resulting from an improper installation is not covered by the
limited warranty.
4.
Rough in the Electrical Supply, if Needed
1.
As necessary, rough in the fireplace electrical supply per NEC and local codes.
5.
Place the Fireplace in the Framing and Secure
NOTE:
Combustible framing may be in direct contact with the nailing flanges and may be located within 1/2” of screw
heads and the firebox wrapper in areas adjacent to the nailing flanges.
Frame the opening to the exact dimensions specified in the framing details in this manual.
1.
Bend out the appropriate nailing flanges for the drywall / finish material to be used (
Figure 11
). Nailing flanges
are provided for:
• flush framing,
• 1/2”, and
• 5/8” framing depths.
2.
Secure the fireplace to the side framing members using the unit’s nailing flanges—one top and bottom on each
side of the fireplace front (
Figure 11
). Use 8d nails or the equivalent.
Figure 11 - Nailing Flanges
Nailing Flanges
Are Provided At
All Four Corners
Side
Framing
Unit
Nailing
Flanges
5/8 in.
1/2 in.
Flush
Side
framing
Unit nailing flange
(no clearance to combustible
framing is required)
5/8”
1/2”
Flush
