Innovation Series & ReCon Water Heater
GF-5050
Venting and Combustion Air Guide
TAG-0043_0Q
12/01/2016
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
•
Phone: 800-526-0288
Page
25
of
39
3.4. VENT PIPE SIZING *
The maximum length is the combined length of straight horizontal and vertical runs, and the
equivalent straight length of fittings and transition pieces of pipe. The maximum equivalent lengths
and minimum pipe diameters are given below in Table 4 for each heater.
Table 4: Venting Pipe Run Lengths
Model No.
Inn600
INN600, INN800, INN1060,
INN1350, INN1400
ReCon 1000
Vent Diameter
4”
(102 mm)
6”
(152 mm)
6”
(152 mm)
Maximum Vent
Equivalent Feet (Meters)
80 ft.
(24.4 m)
140 ft.
(42.7 m)
140 ft.
(42.7 m)
Examples:
1. A 40 foot (12.2 m) length of vent pipe and 1 sharp 90° elbow plus a termination (exit cone
or rain cap) add up to 40 ft. + 10 ft. + 10 ft. = 60 equivalent ft. (18.3 m).
2. A 30 foot (9.1 m) length of vent pipe and 2 sharp 90° elbows plus a termination (exit cone
or rain cap) add up to 30 ft. + (2 x 10 ft.) + 10 ft. = 50 equivalent ft. (15.25 m)
* NOTE
: The maximum combined pressure drop of the exhaust and intake-air vents is
140
equivalent-feet (42.7 m) for
6”
(152 mm) pipe (all models). For the INN600 using
4”
(102
mm) pipe the maximum combined pressure drop of exhaust and intake-air vents is
80
(24.4 m) equivalent-feet.
3.5. COMMON VENT PIPE SIZING
IMPORTANT NOTES:
1. AERCO forced draft water heaters are designed for application in common vent systems.
2. Please consult the AERCO factory for all applications utilizing common ducted combustion air
with common breeching of exhausts.
3. AERCO boilers and AERCO water heaters may share common combustion air and exhaust
breeching. Other configurations, not depicted in this guide, are possible. If you intend to
implement any of these options, please contact your local AERCO representative or the
AERCO factory for project specific venting and combustion air configurations and for design
assistance and approval when designing manifolded exhaust vent systems.
Connections to common vent breeching or duct work must be accomplished with a 45° elbow in the
direction of flow in the main breeching. “Tees” should not be used to accomplish these connections.
See Figure 11a. Similarly, transition from common horizontal vent to common vertical vent section
with condensate drain should use lateral boot-T, as shown in Figure 12, below.
