Crown Boiler Phantom X series, Installation And Operating Instructions Manual, Page: 17 / 136

17
IV. Venting
A. General Guidelines (continued)
Table 8: Vent and Combustion Air Pipe Sizes and Equivalent Lengths
(Applies to All Listed Vent/Combustion Air System Options)
Boiler Model Option
Combustion Air Length Vent Length
Approx. Derate at
Max. Length
(%)
Pipe Dia., in.
(mm)
Min., ft.
(m)
Max., ft.
(m)
Pipe Dia., in.
(mm)
Min., ft.
(m)
Max., ft.
(m)
PHNTM399C
Standard
Diameter
4 (100 or 110) 0 100 (30.5) 4 (100 or 110) 2.5 (760) 100 (30.5) 5
Reduced
Diameter
3 (80) 0 50 (15.2) 3 (80) 2.5 (760 ) 50 (15.2 ) 5
PHNTM500C
Standard
Diameter
4 (100 or 110) 0 100 (30.5) 4 (100 or 110) 2.5 (760) 100 (30.5) 11
Reduced
Diameter
3 (80) 0 50 (15.2) 3 (80) 2.5 (760) 50 (15.2 ) 12
Component Equivalent Length
Nominal Diameter 3 in. (80 mm) 4 in. (100 or 110 mm)
90° Elbow, Short Radius 10 ft. (3.0 m) 13 ft. (4.0 m)
90° Elbow, Long Sweep/Sanitary 4.0 ft. (1.2 m) 9 ft. (2.7 m)
45° Elbow 3.0 ft. (0.9 m) 4.5 ft. (1.4 m)
Table 9: Vent System and Combustion Air System Component Equivalent Length
(Applies to All Listed Vent/Combustion Air System Options)
Table 10: Vent and Combustion Air Equivalent Length Calculation Worksheet
Component
Combustion Air Vent
Equivalent
Length Per
Piece
x Quantity =
Subtotal
Equivalent Length
Equivalent
Length Per
Piece
x Quantity =
Subtotal Equivalent
Length
Straight Pipe x = A E
90° Elbow,
Short Radius
x = B F
90° Elbow,
Long Sweep/
Sanitary
x = C G
45° Elbow x = D H
Combustion Air Total
Equivalent Length
= A+B+C+D Vent Total
Equivalent Length
= E+F+G+H
Notes:
1. Total equivalent length cannot exceed maximum equivalent length shown in Table 8.
2. Use elbow equivalent lengths provided in Table 9.
3. Combustion air and vent terminations do not count towards total equivalent length.
4. 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
Measured length = 35 ft.
Equivalent length =35 ft. x 1.2 = 42 ft.
5. Maximum equivalent length of flexible polypropylene liner is 48 ft. (14.6 m).