Specifications

Grand Bay 40 Direct Vent Freestanding
Page 18
January 2000
very important to maintain a balance between the combustion air intake and the flue gas exhaust
venting system. The types of installation are:
Horizontal Termination (Figure 1) Vertical Termination (Figure 2)
Into a Class A Metal Chimney (Figure 3)* Into a Masonry Chimney (Figure 4)*
*USA installations only
Note: Certain limitations as to vent and vertical termination configuration apply, and
must be strictly adhered to.
When planning your installation, it will be necessary to select the proper length of vent pipe for your
particular requirements. The vent graph on page 20 will show the relationship between vertical and horizontal
side wall venting, and will help to determine the various vent lengths permitted. It is also important to note
the wall thickness. Select the amount of vertical rise desired for vertical-to-horizontal type installations.
To determine the length of your pipe required for vertical installations, measure the distance from the
application flue outlet to the ceiling, the ceiling thickness, the vertical rise in an attic or second story, and
allow for sufficient vent height above the roofline. For two-story applications, fire stops are required at
each floor level. If an offset is needed in the attic, additional pipe and elbows will be required.
When installing this appliance into an existing masonry chimney, it is important to carefully measure the
length of flex needed to reach from the appliance outlet to the termination cap. If the flex length is too short,
a flex coupler will be needed to attach an additional length of flex liner to make up the difference. If the flex
length is too long, the liner could sag below the appliance outlet, which could result in a potential fire
hazard.
PLANNING YOUR INSTALLATION
There are four types of direct vent system installations approved for use with the GBDV-40. It is