Superior Fireplaces DRT3535DEN Installation And Operation Instruction Manual page 22

Innovative Hearth Products
DRT/DRC3500 Series Direct-Vent Gas Fireplaces
Install the Vent Restrictor (if necessary)
9.
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 (Figures 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"
None Break-Away
horizontal run (flat to near level)
40
20
5
3
2
1
Elbow**
1.9
* For straight runs or runs with elbows as illustrated in Vertical Vent Figures/Tables starting on
Page 28
** No rise required.
*** NOTE: In 35" Models, when venting Rear Horizontal with slip collar and termination only,
install base vent restrictor with the breakaway portion raised
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 12), 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 13), from inside or outside the unit, in the
inner fireplace collar. The vent restrictor is held in place by friction.
22
3" Base 3" Base + wing
25 ft Maximum
Horizontal Distance (ft)
5 10 15 25
Figure 12 - Vent restrictor installation, Top vent
60 ft Maximum vertical run
*
60
40
Figure 13 - Vent restrictor installation, Rear vent
10
6
Figure 14 - Vent restrictor assembly
6 ft Minimum
vertical run *
U-Shaped Vent
Restrictor
U-Shaped Vent
Restrictor
Inner
Fireplace
Inner
Collar
Fireplace
Appliance Top Vent Outlet
Collar
Appliance Top Vent Outlet
U-Shaped Vent
Restrictor
Inner
Inner Fireplace Collar Appliance Rear
Fireplace
INNER FIREPLACE
APPLIANCE REAR
Inner Fireplace Collar Collar Appliance Rear Vent Outlet
COLLAR
INNER FIREPLACE
APPLIANCE REAR
Appliance Top Vent Outlet Vent Outlet
COLLAR
VENT OUTLET
U-Shaped Vent
U-Shaped Vent
Restrictor
Restrictor
U-Shaped Vent
Restrictor
Intake Air Baffle
Inner Fireplace Collar Appliance Rear
Intake Air Baffle
INNER FIREPLACE
APPLIANCE REAR
Vent Outlet
COLLAR
VENT OUTLET
U-Shaped Vent
Inner
Restrictor
Fireplace
Collar
Appliance Top Vent Outlet
Intake Air Baffle
Inner Fireplace Collar Appliance Rear
INNER FIREPLACE
APPLIANCE REAR
Vent Outlet
COLLAR
VENT OUTLET
U-Shaped Vent
U-SHAPED VENT
Base Vent Restrictor
Base Vent Restrictor
Restrictor
RESTRICTOR
Base Vent Restrictor
Intake Air Baffle
Base Vent Restrictor
Base Vent Restrictor + Wing
Base Vent Restrictor + Wing
Base Vent Restrictor + Wing
With break-away
raised***
Base Vent Restrictor + Wing
Base Vent Restrictor
Base Vent Restrictor + Wing
Installation
900298-00, 02/2018
VENT OUTLET
U-SHAPED VENT
U-SHAPED VENT
RESTRICTOR
RESTRICTOR
U-SHAPED VENT
RESTRICTOR
With break-away
With break-away
With break-away
raised***
raised*** raised***
With break-away
raised***