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Figure 7
Vent Check
Vent Pipe
Typical Gas
Water Heater
NOTE: If flame pulls towards draft hood, this indicates sufficient
infiltration air.
Venting to Existing Masonry Chimney
Dedicated venting of one fan assisted furnace into any
masonry chimney is restricted. A chimney must first be lined with
either Type B vent sized in accordance with NFGC tables 13.1 or
13.2 or a listed, metal lining system. (See Section Masonry
Chimney Venting of these instructions)
6. Horizontal Venting
Category I Furnaces With External Power
Venters
In order to maintain a Category I classification of fan--assisted
furnaces when vented horizontally with sidewall termination, a
power venter is REQUIRED to maintain a negative pressure in the
venting system.
In the U.S.: Per the NFGC, a listed power venter may be used,
when approved by the authority having jurisdiction.
In Canada: Only power venters approved by the appliance
manufacturer and where allowed by the authority having jurisdiction
may be used.
Please consult the Fields Controls Co. or Tjernlund Products, Inc.
for power venters certified for use with our furnaces.
441 01 5003 01
Draft Hood
Match
Specifications are subject to change without notice
Listed, corrugated metallic chimney liner systems in masonry
chimneys shall be sized by using NFGC tables per 13.1.7 for
dedicated venting and per 13.2.20 for common venting with the
maximum capacity reduced by 20% (0.80 X maximum capacity)
and the minimum capacity as shown in the applicable table. In
Canada, use the NSCNGPIC, appendix C, Section 10. Corrugated
metal vent systems installed with bends or offsets require additional
reduction of 5% of the vent capacity for each bend up to 45° and
10% of the vent capacity for each bend from 45° up to 90°.
NOTE: Two (2) 45° elbows are equivalent to one (1) 90° elbow.
Combined Venting into an Interior Masonry Chimney
Venting into an interior masonry or concrete chimney is only
permitted as outlined in the NFGC venting tables. Follow all
safe venting requirements.
Note: See section "Masonry Chimney Venting".
Vent Termination
Venting Through a Non- Combustible and Combustible
Wall
Consult External Power Venter manufacturer instructions.
Select the power venter to match the Btuh input of the furnace being
vented. Follow all of the power venter manufacturer's installation
requirements included with the power venter for:
venting installation,
•
•
vent terminal location,
•
preventing blockage by snow,
•
protecting building materials from degradation by flue gases,
see Figure 8 for required vent termination.
•
It is the responsibility of the installer to properly
NOTE:
terminate the vent and provide adequate shielding. This is
essential in order to avoid water/ice damage to building,
shrubs and walkways.
11
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