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SECTION 2
EDR-PURE-IOM-230608
occurring. If the maximum negative pressure is exceeded due to excessive
natural draft (stack e ect), the exhaust system may require the use of
draft accessories such as a xed-position balancing ba e or modulating
overdraft damper. Draft accessories must be appropriate for Category II/
IV installations and are not included with the boiler. Consult your venting
supplier for recommendations.
6. Adhere to local and jurisdictional codes and regulations, which may di er
from recommendations and diagrams contained in this manual.
7. Site speci c conditions not addressed in this manual may require
additional precautions or design considerations. Consult your local Fulton
Representative and venting supplier for recommendations.
–
NOTE:
Consult your venting pipe supplier for assistance with sizing of vent
materials and other potentially required accessories.
8. The layout of the piping used for air intake and exhaust must be done in a
way that facilitates smooth travel and natural ow.
9. A pressure drop calculation is an acceptable method for evaluating
theoretical draft, but is not enough information to fully validate
combustion air intake and ue gas exhaust vent systems. The designer and
installer must use good practice and remain cognizant of important factors
that cannot be captured by a pressure drop calculation such as local code
requirements, accessibility for inspection and maintenance, aesthetic
concerns, ue gas recirculation, stagnant vapor plumes, prevailing wind
direction, nearby mechanical equipment and other design considerations
as detailed in this manual. Some recommendations:
ƒ
Avoid sharp turns, boot tees, bullhead tees, back-to-back 90
degree elbows, and short radius elbows.
ƒ
Avoid extensive direction changes ( ue gases being required
to turn around).
ƒ
Never direct ue stacks in a downward direction.
Combustion Air Intake
Adhere to the folllowing for installation:
1. It is the responsibility of the designer and installer of the venting system to
guarantee the prevention of ue gas recirculation ( ue gases being drawn
into a boiler's combustion air supply, or ue gases moving backward
through an idle boiler).
2. The installation of room exhaust fans in a boiler room should be avoided.
An exhaust fan or similar equipment can create down draft in the stack or
restrict the burner's air supply, resulting in poor combustion or life safety
hazard.
3. It is essential that only fresh air is allowed to enter the combustion
air system. Foreign substances, such as combustible volatiles in the
combustion system can create hazardous conditions.
Questions? Please Contact Your Local Manufacturer's Representative
INSTALLATION
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
4
CAUTION
Ensure there is not a negative pressure in the
boiler room. The boiler room pressure must
be neutral relative to the outdoors.
Particulate matter or chemicals (example:
chlorine, uorine, perchlorethylene,
halogenated compounds) in the
combustion air supply to the boiler will
cause damage or failure to the burner.
High-risk situations for particulate matter
to be in the air include construction and
maintenance activities. See Table 5.
2-23
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