Installation
900697-01 01/2017
Innovative Hearth Products
DRT4000 Series Direct-Vent Gas Fireplaces
22
10.
Install the Vent Restrictor (if necessary)
1.
Use the vent run descriptions in
Figure 12
to determine if a vent restrictor is necessary.
2.
If necessary, assemble the vent restrictor and wing as detailed in
Figures 12
and
15
.
3.
If necessary, install the appropriate vent restrictor
(
Figures 13 or 14
).
NOTE:
If installing the vent restrictor in a rear vent application, ensure the factory-installed intake air baffle is in place
(
Figure 14
)
.
NOTE:
The vent restrictor is shipped in the firebox.
Figure 12 - When to use a vent restrictor
2 1/2”
Break-Away
1
3
20
40
6
10
40
25 ft Maximum
horizontal run (flat to near level)
60 ft Maximum vertical run
60
1.9
25
Horizontal Distance (ft)
Vertical Height (ft) from top of unit
Vertical Height (ft)
2
5
Elbow**
5
10
15
3” Base + wing
3” Base
6 ft Minimum
vertical run
6 ft Minimum vertical ru
n
None
*
*
*
For straight runs or runs with elbows as illustrated in Vertical Vent Figures/Tables starting on
Page 28
** No rise required.
Vent Restrictor with Vertical Terminations
When vertically terminating the vent system through the roof and using the vent restrictor, install the vent restrictor
in the top vent of the fireplace outlet.
If installing more than 6 ft of vertical venting, install the restrictor
(
Figure 13
),
from inside or outside the unit, in the
inner fireplace collar. The vent restrictor is held in place by friction.
Vent Restrictor with Horizontal Terminations
When horizontally terminating a vent system with a vertical vent run up to 4 ft through an exterior wall, no vent
restrictor is required.
If installing more than 4 ft of vertical venting, install the restrictor
(
Figure 14
)
, from inside or outside the unit, in the
inner fireplace collar. The vent restrictor is held in place by friction.
Figure 13 - Vent restrictor installation, Top vent
U-Shaped Vent
Restrictor
Inner
Fireplace
Collar
Appliance Top Vent Outlet
U-SHAPED VENT
RESTRICTOR
APPLIANCE REAR
VENT OUTLET
INNER FIREPLACE
COLLAR
Inner Fireplace Collar
Appliance Rear
Vent Outlet
U-Shaped Vent
Restrictor
Intake Air Baffle
Base Vent Restrictor
Base Vent Rest Wing
With break-away
raised***
Figure 14 - Vent restrictor installation, Rear vent
Figure 15 - Vent restrictor assembly
U-Shaped Vent
Restrictor
Inner
Fireplace
Collar
Appliance Top Vent Outlet
U-SHAPED VENT
RESTRICTOR
APPLIANCE REAR
VENT OUTLET
INNER FIREPLACE
COLLAR
Inner Fireplace Collar
Appliance Rear
Vent Outlet
U-Shaped Vent
Restrictor
Intake Air Baffle
Base Vent Restrictor
Base Vent Rest Wing
With break-away
raised***
Base Vent Restrictor
U-Shaped Vent
Restrictor
Inner
Fireplace
Collar
Appliance Top Vent Outlet
U-SHAPED VENT
RESTRICTOR
APPLIANCE REAR
VENT OUTLET
INNER FIREPLACE
COLLAR
Inner Fireplace Collar
Appliance Rear
Vent Outlet
U-Shaped Vent
Restrictor
Intake Air Baffle
Base Vent Restrictor
Base Vent Rest Wing
With break-away
raised***
Base Vent Rest Wing
With break-away
raised***
Inner Fireplace Collar
Appliance Rear
Vent Outlet
U-Shaped Vent
Restrictor
