Optional PVC vent system installation instructions supplement
7
O
Terminal Type
Combustion Air
Turn Down Ratio
Tee
Indoor
3:1
Outdoor
4:1
45° Elbow
Indoor
n/a
Outdoor
3:1
90° Elbow
Indoor
3:1
Outdoor
4:1
Coupling
Indoor
3:1
Outdoor
4:1
1/4'' SS Bird Screen
In Opening
Figure 8
Vertical PVC Terminal
Th e input of the unit must be set per Table 2 or nuisance shutdowns
may occur under strong wind conditions.
Table 1
Turn Down vs Combustion Air Source
When vented vertically the vent and air intake systems should be
terminated using standard 45° and 90° PVC Elbow fi tt ings with a
1/4 in stainless steel bird-screen insert as shown below.
Th e rest of the applicable Combustion Air & Ventilation and Venting
instructions contained in the INSTALLATION & OPERA
TION
MANUAL MUST BE FOLLOWED.