InnoFlue Dual Pipe venting

Condensing Tankless
Water Heater
Dual Pipe Vent
InnoFlue® Vent System
Centrotherm-10/03/2011 • © 2011 Rinnai Corporation
Why Has Rinnai Certified Dual Pipe?
• Customer requests to allow for greater installation flexibility
and lower cost for longer vent runs for CONDENSING water
heaters only.
• Because Centrotherm Eco Systems now offers a
polypropylene-S, single-wall vent pipe (Rinnai will only allow
PPs for exhaust flue pipe), whereas before only PVC was
• The Centrotherm Innoflue® PP-s vent pipe is the same
product as the vent pipe inside Ubbink’s concentric venting,
which Rinnai has offered up to now. • © 2011 Rinnai Corporation
InnoFlue® Polypropylene Technology
The PP-s exhaust venting is a product called InnoFlue® made by Centrotherm
Eco Systems, a sister company of our concentric venting supplier, Ubbink. It is
the same material as the inner pipe of our concentric venting for our Condensing
product. It MUST be used for the exhaust venting/flue and can also be used for
the intake air. • © 2011 Rinnai Corporation
InnoFlue® PP-s: Features & Benefits
• Condensing Water Heater product
• 3” diameter polypropylene pipe
• Can be used for both Intake and
• Can substitute PVC for intake
ONLY (only PPs can be used
for Exhaust venting)
• Maximum vent length is based on
number and type of elbows
• Zero clearance to combustibles
• Gasketed PP-s allows for faster,
cleaner installation with no fit-up or
glue and primers required • © 2011 Rinnai Corporation
Benefits of the “dual pipe” option with InnoFlue®
• Engineered specifically for gas appliance venting
• Positive fit and lock allows for secure joints and quick connections
• Easier to locate venting in tight spaces, such as between ceiling and
• Zero-clearance to combustibles
• 10-year warranty on InnoFlue® PP-s venting
• InnoFlue® is 100% recyclable, earning LEED points by eliminating
solvent-based primers and adhesives
• Polypropylene is far superior to PVC as exhaust venting. It has a
maximum temperature rating of 230°F(110°C), compared to
146°F(65°C) for PVC and 194°F(90°C) for CPVC • © 2011 Rinnai Corporation
GUIDELINES • © 2011 Rinnai Corporation
When installing the Centrotherm 2 pipe system:
Comply with the exhaust clearances found in the Rinnai Operation and Installation Manual.
Only one appliance can be attached to the vent system.
Install the system in according to the Centrotherm Installation Instructions
Use the 3”/5” concentric to twin pipe adaptor and 3” diameter venting.
The vent termination and air intake must be in the same pressure zone.
Do not exceed maximum straight vent length with number of elbows as shown in tables.
Maintain the clearances shown in the figures below. • © 2011 Rinnai Corporation
WARNING: Do Not use PVC on the exhaust venting. PVC is allowed on the intake only. • © 2011 Rinnai Corporation
Vent Length Tables
Maximum Straight Vent Length
There are two types of elbows, short radius and long radius.
1. Refer to correct table for your type of elbow (long/short) to find the maximum straight vent
2. Count the number of elbows in your venting excluding the termination/intake.
3. Refer to the third column. If required based on vent length, move switch #1 in the tan dip
switches to off. • © 2011 Rinnai Corporation
• Installation and maintenance of InnoFlue® vent systems must be
preformed by a Licensed professional . Centrotherm recommends
annual inspections of any InnoFlue vent system
• All installations must conform to all relevant Local, State and National
• Refer to Rinnai’s installation instructions for restrictions such as total
equivalent vent length, number of allowable elbows, sizing of vent
systems and the use of appliance adaptors.
• InnoFlue® vent components must be used throughout the entire vent
system. Do not mix with other vent manufacturer’s products. • © 2011 Rinnai Corporation
Vent Pitch
Horizontal vent configurations must be pitched towards the appliance and at an angle of no less than 3°
or 5/8”/ft. (5.6cm/m)
Male ends of all components must point towards the appliance to assure free condensate flow to the
condensate drain of the appliance.
Reminder… InnoFlue® can be installed at zero-clearance to combustible materials.
Install a Support Bracket at any directional changes such as Elbows or Tee sections as needed.
Vent Terminations
Horizontal terminations should go straight through wall. Vent cannot extend more than 12” ( 30cm) from
the wall exterior.
Termination Tee’s, 45°, or 90° elbows may be used to direct flue gases in desired directions.
All outside piping must be the UV-rated PP-s (Black piping)
Install Bird Screens into any exterior vent or air intake opening • © 2011 Rinnai Corporation
• Gaskets are factory installed in all InnoFlue® components. If a gasket is
missing or damaged, it must be replaced by a correctly-sized Centrotherm
supplied gasket
• CAUTION: leaking gaskets can cause the formation of dangerous carbon
monoxide or property damage due to condensate leaks!
• When measuring vent length required, ensure to include the depth of the
female socket to the total length required.
• When field cutting InnoFlue® vent lengths, use a hack saw and miter box to
create a perpendicular, clean cut, ensuring to deburr cut, so that any damage
to gasket is avoided.
Cut • © 2011 Rinnai Corporation
Joint Connections
Place Centrocerin, a water based lubricant on the gasket of component 1 for ease of assembly.
Slip a Connector Ring over male end of component 2 so that that it can grip the gasket bead of
component 1.
Connector Ring
Push and twist male end until it bottoms out in component 1.
Clip the Connector Ring onto gasket bead to secure the two components to each other.
Install support brackets for horizontal venting onto solid ceiling joist or surfaces to avoid future
movement or sagging. Space supports no more than 39” (1m) apart.
Install support brackets for vertical, wall mounted vent configuration. space brackets no more than 78”
(2m) apart. • © 2011 Rinnai Corporation
Possible Installation Scenarios • © 2011 Rinnai Corporation
InnoFlue® Parts
ISELL0387 87° LongRadius Elbow • © 2011 Rinnai Corporation
Vent Clearances • © 2011 Rinnai Corporation
Vent Clearances
U.S. Specifications
Canadian Specifications
Clearance above grade, veranda, porch, deck or balcony
12 inches (30 cm)
12” (30 cm)
Clearance to window or door that maybe opened
12 inches (30 cm)
36” (91 cm)
Clearance to permanently closed window
Vertical clearance to ventilated soffit, located above the terminal
within a horizontal distance of 2 feet (61 cm) from the center line of
the terminal
Clearance to unvented soffit
Clearance to outside corner
Clearance to inside corner
Clearance to side of center line extended above meter / regulator
3 feet (91 cm) within a height 15
feet (5 m) above the meter /
regulator assembly
Clearance to service regulator vent outlet
36 inches (91 cm)
Clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance
12 inches (30 cm)
36 inches (91 cm)
Clearance to a mechanical air supply inlet
3 feet (91 cm) above if within 10
feet (3 m) horizontally
6 feet (2 m)
Clearance above paved sidewalk or paved driveway located on the
public property
7 feet (2.25 m)
Clearance under veranda, porch, deck, or balcony
12 inches (30 cm)
* For clearances not specified in ANSI Z223. 1/NFPA 54 or CGA-B149. clearances are in accordance with local installation
codes and the requirements of the gas supplier. • © 2011 Rinnai Corporation
InnoFlue® FAQ’s
1. Why is InnoFlue® sloped back towards appliance?
• InnoFlue® is intended for use on condensing heating appliances. Condensing appliances
generate one gallon of condensate per hour per hundred thousand BTU’s. A pitched
system ensures that condensate does not build up inside vent system.
2. What is the required slope of an InnoFlue® SW vent system?
• InnoFlue® requires a slope of 3° or 5/8”per foot.
3. Can I field cut InnoFlue®?
• InnoFlue® can be field cut to length using a hacksaw and miter box or equivalent.
InnoFlue® must be cut on the male end of the pipe, preserving the socketed (female) end.
After making cut, the end can be beveled at the contractor’s discretion. The end must be
deburred using a standard deburring tool or sand paper.
4. Can InnoFlue® be painted?
• Yes, the exterior of InnoFlue® can be painted. Please follow the surface preparation
instructions specified by the paint manufacturer. • © 2011 Rinnai Corporation
The End
Condensing Tankless
Water Heater
Dual Pipe Vent System
InnoFlue® Vent System
Centrotherm-10/03/2011 • © 2011 Rinnai Corporation

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