18
IV. Venting
A. General Guidelines (continued)
a. Use only listed vent/combustion air terminals.
i.
Horizontal Sidewall Venting: For models
APX425 and APX 525, use tee terminals for
both vent and combustion air as shown in
Figure 5A. For models APX625, APX725,
and APX825, use tee terminals or 90°
elbows for both vent and combustion air as
shown in Figure 5A or Figure 5B. Alternate
snorkel terminations are shown in Figure 6A
and Figure 6B.
ii.
Vertical Roof Venting: Use straight
coupling on vent and two 90° elbows turned
downwards for combustion air as shown in
Figure 7 and Figure 8.
b. Maintain correct clearance and orientation
between vent and combustion air terminals.
Table 6B: Vent/Combustion Air Equivalent Length Calculation Work Sheet
Combustion Air
Vent
90° Elbow(s) (Installer Supplied)
90° Elbow(s) (CPVC Supplied with Boiler)
Nominal Diameter
Quantity
(Pc)
Equivalent
Length, per Pc
Subtotal,
Equivalent
Length (A)
Nominal Diameter Quantity
(Pc)
Equivalent Length,
per Pc
Subtotal,
Equivalent
Length (D)
4 in.
(100 mm or 110 mm)
13 ft. (4.0 m)
4 in.
(100 mm or 110 mm)
1
13 ft. (4.0 m)
13 ft. (4.0 m)
6 in.
(150 mm or 160 mm)
22 ft. (6.7 m)
6 in.
(150 mm or 160 mm)
1
22 ft. (6.7 m)
22 ft. (6.7 m)
45° Elbow(s) (Installer Supplied)
90° Elbow(s) (Installer Supplied)
Nominal Diameter
Quantity
(Pc)
Equivalent
Length, per Pc
Subtotal,
Equivalent
Length (B)
Nominal Diameter
Quantity
(Pc)
Equivalent Length,
per Pc
Subtotal,
Equivalent
Length (A)
4 in.
(100 mm or 110 mm)
4.5 ft. (1.4 m)
4 in.
(100 mm or 110 mm)
13 ft. (4.0 m)
6 in.
(150 mm or 160 mm)
7.5 ft. (2.3 m)
6 in.
(150 mm or 160 mm)
22 ft. (6.7 m)
Straight Pipe, (Installer Supplied)
45° Elbow(s) (Installer Supplied)
Nominal Diameter
Quantity
Length,
ft or m
Equivalent
Length,
ft/ft or m/m
Subtotal,
Equivalent
Length (C)
Nominal Diameter
Quantity
Length,
ft or m
Equivalent Length,
ft/ft or m/m
Subtotal,
Equivalent
Length (B)
4 in.
(100 mm or 110 mm)
1
4 in.
(100 mm or 110 mm)
4.5 ft. (1.4 m)
6 in.
(150 mm or 160 mm)
1
6 in.
(150 mm or 160 mm)
7.5 ft. (2.3 m)
* Total Equivalent Length (A+B+C) =
2.5 Ft. (760 mm) Straight Pipe, (CPVC Supplied with Boiler)
*
Notes:
1. Calculated total equivalent length cannot exceed
maximum equivalent length shown in Table 5.
2. Vent and combustion air terminals do not count towards
total equivalent length.
3. Pressure drop for flexible polypropylene liner is 20%
greater than for rigid pipe. Multiply measured flexible
polypropylene liner length by 1.2 to obtain equivalent
length.
Example
Measure length of flexible polypropylene liner = 35 ft.
Equivalent length of flexible polypropylene liner = 35 ft.
x 1.2 = 42 ft.
4. Maximum equivalent length of flexible polypropylene liner
is 48 ft. (14.6 m).
5. All elbows referenced are short radius.
Nominal Diameter
Quantity
Length,
ft or m
Equivalent Length,
ft/ft or m/m
Subtotal,
Equivalent
Length (E)
4 in.
(100 mm or 110 mm)
2.5 ft.
(0.76 m)
1
2.5 ft.
(0.76 m)
6 in.
(150 mm or 160 mm)
2.5 ft.
(0.76 m)
1
2.5 ft.
(0.76 m)
Straight Pipe, (Installer Supplied)
Nominal Diameter
Quantity
Length,
ft
Equivalent Length,
ft/ft
Subtotal,
Equivalent
Length (C)
4 in.
(100 mm or 110 mm)
1
6 in.
(150 mm or 160 mm)
1
* Total Equivalent Length (A+B+C+D+E) =
Figure 5A: Direct Vent - Sidewall Tee Terminations
Summary of Contents for APEX
Page 57: ...57 VIII Electrical continued Figure 26 Ladder Diagram ...
Page 58: ...58 VIII Electrical continued ...
Page 59: ...59 Figure 27 Wiring Connections Diagram VIII Electrical continued ...
Page 105: ...105 ...
Page 109: ...109 XIII Repair Parts continued APX625 APX725 and APX825 APX825 shown ...
Page 112: ...112 XIII Repair Parts continued APX425 and APX525 ...
Page 114: ...114 XIII Repair Parts continued APX625 APX725 and APX825 ...
Page 122: ...122 ...
Page 123: ...123 ...
