Vent Diagrams - Heatilator LEGACY42-IFT Installation Manual

E. Vent Diagrams
As shown in Figure 4.5, many different top vent or vent configurations are possible with the LEGACY appliance, however
there are few general rules that must be followed:
2' 2'
28 '
2'
12 '
Figure 4.5 Venting
18
28'V+2'E=30'TV
16'
16'H+12'V+2'E=30'TV
26'H+4'E=30'TV
2'
2'
8'
30 Ft Maximum
General Rules
•The LEGACY models require the use of the power vent termination cap supplied with
the appliance.
•A maximum of 30 ft of vent, whether horizontal or vertical, can be used regardless of
vent configuration. Elbows must be factored in when determining maximum allowable
vent configuration.
•Maximum 30 ft length of vent is a measurement of the total vent used. (Sample
venting configurations shown above with dimensions for reference only)
•Each 90° elbow, whether installed vertically or horizontally, counts as two feet towards
the total vent run.
•Each 45° elbow, whether installed vertically or horizontally, counts a one foot towards
the total vent run.
•A maximum of three 90° elbows (or six 45° elbows) may be used in any vent configu-
ration.
•Elbows may be placed back to back anywhere in the system.
•Any 90° elbow may be replaced with two 45° elbows.
•When penetrating a combustible wall, a wall shield firestop must be installed on one
side of the wall. The wall where the termination cap is located requires a wall shield
only on the interior side.
•Horizontal runs of vent do not require vertical rise; horizontal runs may be level.
Heatilator • LEGACY42-IFT Installation Manual • 4095-901 Rev. A • 12/17
Vent Calculation
H+V+E=TV
H=Horizontal Vent
V=Vertical Vent
E=Elbow
TV=Total Vent
18'
30'H=30'TV
30 '