Combustion Air And Ventilation Openings; Insufficient Ventilation And Combustion Air - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 4: Installation Instructions
B149.1, use vent systems that are certified to the standard for Type BH Gas Venting Systems, ULC-
S636.
Please note that 10" and 12" PVC can be heavy and expensive. Alternative vent materials, such as
AL29-4C or polypropylene should be considered prior to installation.
The plastic components, primers and glues of the certified vent system must be from a single system
manufacturer and not mixed with other manufacturer's vent system parts.
The Inspection Port should be plugged with an appropriate plug (not included).
Figure 4-14: Installed Flue Exhaust Diameter Reduction Adaptor Kit

4.21 Combustion Air and Ventilation Openings

Provisions for combustion and ventilation air must be made in accordance with section 5.3, Air for
Combustion and Ventilation, of the National Flue Gas Code, ANSI Z223.1/NFPA 54., or Sections
7.2, 7.3 or 7.4 of CAN/CSA-B149.1-05, installation codes, or applicable provisions of the local
building codes.

4.21.1 Insufficient Ventilation and Combustion Air

C A U T I O N
BOILER DAMAGE AND OPERATIONAL FAILURES may occur due to insufficient or improper
openings for combustion air and/or ventilation of the boiler room.
Provisions for combustion air and ventilation are always required, regardless of whether combustion
air is taken from the outside (sealed combustion) or inside (room air used as combustion air).
Insufficient ventilation of the boiler room can lead to high air temperatures and result in boiler damage.
OMM-0160_A • DRAFT Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
FLUE VENT PIPE
INSTALL FLUE PIPING TO
ADAPTER WITH RTV
LIQUID SILICONE AND
WORM-DRIVEN
HOSE CLAMP
ADAPTER ASSEMBLY
EUROPEAN-TO-AMERICAN
STANDARD FLUE ADAPTER
Page 40 of 117
3 feet
(914.4 mm)
Test Nipple
should be
installed
within first
3 feet of
flue start.