Installation
900960-00C, 06/2019
Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
22
9.
Install the Vent Restrictor (if necessary)
1. Use the vent run descriptions in
Figure 11
to determine if a vent restrictor is necessary.
2. If necessary, assemble the vent restrictor and wing as detailed in
Figures 11
and
14
.
3. If necessary, install the appropriate vent restrictor (
Figure 12 or 13
).
NOTE: If installing the vent restrictor in a rear vent application, ensure the factory-installed intake air baffle is in place (
Figure 13
).
NOTE: The vent restrictor is shipped in the firebox.
Figure 11 - 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 29
** No rise required.
Figure 12 - 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 13 - Vent restrictor installation, Rear vent
Figure 14 - 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
Intake Air Baffle
Minimal Restrictor