MHSC CDVR33 - Installation Planning

16 69D0023
CDV Series Gas Fireplace
VENT INSTALLATION
INSTALLATION PLANNING
There are two basic types of direct-vent installation:
• Horizontal Termination
• Vertical Termination
It is important to select the proper length of vent pipe for the type of termination you choose. It is also important
to note the wall thickness.
FOR HORIZONTAL TERMINATION
Select the amount of vertical rise desired. All horizontal run
of venting must have
1
/4" rise for every 12" of run towards
the termination. With 7
1
/2 feet or more vertical rise off top of
replace, the horizontal run may run level. NEVER run vent
piping downward.
You may use up to three 90° elbows in this vent conguration.
See Horizontal Termination Congurations on pages 21 and 22.
FOR VERTICAL TERMINATION
Measure the distance from the replace oor to the ceiling. Add the ceiling thickness, the vertical rise in an attic
or second story, and allow for sufcient vent height above the roof line.
NOTE: You may use two 45° elbows in place of a 90° elbow. You must follow rise to run ratios when using
45° elbows. The appliance is approved for use with three 90° elbows maximum or a combination of 90°
and 45° elbows up to a maximum of 270°.
For two-story applications, restops are required at each oor level. If an offset is needed in the attic, additional
pipe and elbows will be required.
You may use a chase with a vent termination with exposed pipe on the exterior of the house. See Installing Vent
System in a Chase below. If pipe is enclosed in chase, it is not exposed.
It is very important that the venting system maintain its balance between the combustion air intake and the ue
gas exhaust. Certain limitations apply to vent congurations and must be strictly followed.
INSTALLING A VENT SYSTEM IN AN OUTSIDE CHASE
A chase is a vertical boxlike structure built to enclose venting that runs along the outside of a building. A chase
is required for such venting.
WARNING
Never run th e v en t p ip e
   


NOTICE

      

NOTICE
When installing in a chase, you should insulate the chase as you would the outside
           
          
