SECTION 17: D
UCT
C
ONSIDERATIONS
69 of 154
SECTION 17: DUCT CONSIDERATIONS
The air handler has been designed to operate at the
specific air
v
ol
u
me and external static press
u
re that
w
as originally specified. Static press
u
re is increased
by any additional components that are added to the
air handler (i.e. inlet hood, filter section, dampers,
d
u
ct
w
ork, discharge heads, etc) Additional static
press
u
re beyond original intention (or time of order)
w
ill affect the performance of the air handler and
red
u
ce the air
v
ol
u
me that can be deli
v
ered.
Proper engineering methods need to be employed
w
hen calc
u
lating d
u
ct and component static press
u
re
(i.e. 2009 ASHRAE Handbook - F
u
ndamentals,
Chapter 21).
The system d
u
ct
w
ork m
u
st comply
w
ith Sheet Metal
and Air Conditioning Contractors Nationals
Association (SMACNA) or any other recognized
standards.
As a general r
u
le, all d
u
cting sho
u
ld ha
v
e a straight
r
u
n of at least 3 d
u
ct diameters immediately before
and after the air handlers mechanical accessories.
No d
u
ct fittings, elbo
w
s or transitions
w
ith restrictions
can be placed
w
ithin 3 d
u
ct diameters.
D
u
ct diameter for ro
u
nd d
u
cts (in inches):
Dh = d
Dh:diameter
d:ro
u
nd d
u
ct inside diameter
D
u
ct diameter for rectang
u
lar d
u
cts (in inches):
Dh = (2*H*W)/(H+W)
Dh:diameter
H:rectang
u
lar d
u
ct inside height
W:rectang
u
lar d
u
ct inside
w
idth
The air handler is not designed to s
u
pport the
w
eight
of d
u
ct
w
ork. D
u
ct
w
ork m
u
st be constr
u
cted in a
fashion that is self-s
u
pporting. D
u
ct
w
ork sho
u
ld be
straight, elbo
w
s sho
u
ld be minimal and any
transitions sho
u
ld be grad
u
al.
Depending on the options ordered
w
ith the air
handler, flanges (either external or internal) may be
pro
v
ided to facilitate connection of d
u
ct
w
ork. In
cases
w
here flanges are not pro
v
ided, flat s
u
rfaces
on the exterior skin of the air handler are pro
v
ided to
facilitate connection of d
u
ct
w
ork.
Neither the flanges nor exterior skin of the air handler
are capable of s
u
pporting the load of the d
u
ct
w
ork.
D
u
ct
w
ork s
u
pport m
u
st come from the str
u
ct
u
re itself
that the air handler is ser
v
icing. On horizontal r
u
ns, it
is recommended that d
u
ct
w
ork be s
u
pported e
v
ery 6
ft (1.8 m) for d
u
ct
w
ork that has a cross section of 10 ft
(3 m) or less and e
v
ery 4 ft (1.2 m) for d
u
ct
w
ork
w
hich has a cross section of greater than 10 ft (3 m).
On
v
ertical r
u
ns, it is recommended that d
u
ct
w
ork be
s
u
pported e
v
ery 10 ft (3.0 m). On both cases,
s
u
pporting members sho
u
ld be sized to carry the
w
eight load.
17.1 Inlet Air Duct
Inlet d
u
ct
w
ork height and
w
idth m
u
st be no smaller
than the air handler inlet height and
w
idth and s
u
pply
only
u
ncontaminated air to the air handler. (
See
Page 10, Section 5
for ret
u
rn air dimensions).
17.2 Return Air Duct
Ret
u
rn air d
u
ct
w
ork height and
w
idth m
u
st be no
smaller than the air handler ret
u
rn air opening height
and
w
idth. (
See Page 10, Section 5
for ret
u
rn air
dimensions).
17.3 Supply Air Duct Work
S
u
pply air d
u
ct
w
ork sizes sho
u
ld be determined by
the application req
u
irements of the system. S
u
pply
air d
u
ct
w
ork m
u
st be smaller than s
u
pply air
opening.
See Page 10, Section 5
for dimensions.
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and
service.
Edges are sharp.
Falling Hazard
Use proper safety
equipment and prac-
tices to avoid falling.
WARNING
Failure to follow these instructions can result
in death, injury or property damage.
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