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Figure 6. Air handler application recommendations when elbows are
used at appliance connection
Elbow with turning vanes from below
Square heel elbow from below
Round heel elbow from below
GOOD
BAD
BAD
Elbow with turning vanes from the side
Square heel elbow from the side
Round heel elbow from the side
GOOD
BAD
BAD
SECTION 4. COMBUSTION AIR SUPPLY AND FLUE SYSTEM
4.1 Flue systems must comply with national and local
regulations.
4.2
The products of combustion must be flued to outdoor
atmosphere. Common flues for more than one
appliance must
NOT
be used.
4.3 Combustion air should be taken from out-door
atmosphere, this improves the operational efficiency
of the heating system.
4.4
Flues and combustion air ducts where connected to
the air heater must incorporate a disconnect section
adjacent to the appliance to facilitate removal of the
venter assembly for service and replacement
purposes. The flue system must therefore, be
supported independently.
Where flue systems are taken through elements of air
handling appliances then provision must be made to
allow servicing of the flue gas fan assembly. this
will entail fitting a special detachable transfer
section from the appliance flue and combustion air
connection sockets to the outside of the appliance.
The main flue should then respect the criteria outlined
below.
4.5
Dimensions and allowances in suggested flueing and
combustion air intake arrangements are based upon
the use of smooth wall aluminium flue and combustion
air ducts and fittings equipped with positive sealing
gaskets.
4.6
Type C Appliances
4.6.1 When using the concentric termination as fig. 7
arrangement, then only an approved system using
Reznor specified components may be used. These
items are manufactured from seamless aluminium with
connection sockets fitted with silicone double edged
seals, thus assuring, if the components are
undamaged, leak free flue systems.
Important:
This
type of flue/Combustion air intake system is regarded
as an integral part of the air