Installation
900285-01 05/2015
Innovative Hearth Products
Astria
TM
Gemini and GeminiCD 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
Figure 12
and
Figure 15
.
3.
If necessary, install the appropriate vent restrictor (
Figure 13
and
Figure 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
Figure 13: Vent restrictor installation, Top vent
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
*
*
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
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***
Inner Fireplace Collar
Appliance Rear
Vent Outlet
U-Shaped Vent
Restrictor
Intake Air Baffle
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
* For straight runs or runs with elbows as illustrated in Vertical Vent Figures/Tables starting on
Page 28
** No rise required.
*** On 33” Models, use the 3” base restrictor. Do not raise the break-away tab.
NOTE: When venting Rear Horizontal with slip collar and termination only, install base vent
restrictor with the breakaway portion raised.
With
break-away
raised***
***