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Table 2: Maximum Capacity of Schedule 40 Pipe in CFH For Gas Pressures of 0.5 psig or Less
Table 3: Fitting Equivalent Lengths Table 4: Specific Gravity Correction Factors
Length
[Feet]
0.3 inch w.c. Pressure Drop 0.5 inch w.c. Pressure Drop
½ ¾ 1 1¼ ½ ¾ 1 1¼
10 132 278 520 1,050 175 360 680 1,400
20 92 190 350 730 120 250 465 950
30 73 152 285 590 97 200 375 770
40 63 130 245 500 82 170 320 660
50 56 115 215 440 73 151 285 580
60 50 105 195 400 66 138 260 530
70 46 96 180 370 61 125 240 490
80 43 90 170 350 57 118 220 460
90 40 84 160 320 53 110 205 430
100 38 79 150 305 50 103 195 400
Specific
Gravity
Correction
Factor
Specific
Gravity
Correction
Factor
0.50 1.10 1.30 1.07
0.55 1.04 1.40 1.04
0.60 1.00 1.50 1.00
0.65 0.96 1.60 0.97
0.70 0.93 1.70 0.94
0.75 0.90
0.80 0.87
V. Venting
A. General Guidelines.
1. Vent system installation must be in accordance with
National Fuel Gas Code, NFPA 54/ANSI Z221.3,
Part 7, Venting of Equipment; and/or CAN/CGA
B149 Installation Codes, Section 7, Venting Systems
and Air Supply for Appliances; or applicable
provisions of local building codes. Contact local
building or fire officials about restrictions and
installation inspection in your area.
2. This appliance requires a Special Gas Vent. Use Vent
Connector and Vent Terminal in Vent Accessory
Carton provided with boiler (See Repair Parts, Key
No. 8). The product is designed to use Burnham
supplied AL 29-4C
®
Stainless Steel vent system
components. The following manufacturers offer
similar AL 29-4C
®
components and are approved for
use with this product: Heat-Fab Inc. - Saf-T-Vent,
Flex-L International Inc., - Star-34, Protech Systems,
Inc. - FasNSeal™, and Z-Flex U. S., Inc. - Z-Vent.
The use of these alternate manufacturer's venting
systems will require adapters to connect to the
Burnham supplied vent connector and vent terminal.
These adapters are not supplied with this unit and
should be obtained from the supplier of the alternate
manufacturer's venting system. See Table 5 for
complete list of Burnham Vent System Components.
WARNING
Do not use this appliance with nonmetallic
vent systems such as Hart & Cooley
Ultravent, Plexco Plexvent, or Selkirk-
Metalbestos Sel-Vent.
Fitting
Nominal Pipe Size
½ ¾ 1 1¼
45° Ell 0.7 1 1.2 1.6
90° Ell 1.6 2.1 2.6 3.5
Tee (As Elbow) 3.1 4.1 5.2 6.9