© 1995-2009 Energy Saving Products Ltd.
With both the Main Plenum and Rough-In Boot installed,
there is now only the connection of the two. This is done with
the 2”
(51mm)
or HE Flexible Branch Duct. Keep in mind that
the minimum duct length is 10 feet, with a maximum length
of 25 feet
(7.62m)
. Branch duct runs should be kept as short
as possible to maximize the airflow through these runs.
Energy Saving Products supplies the both the 2”
(51mm)
and
the HE flexible duct in three different configurations:
• 2”
(51mm
) x 10’
(3.05m)
AFD (Assembled Flex Duct)
• 2”
(51mm
) x 15’
(4.57m)
AFD (Assembled Flex Duct)
• 2”
(51mm
) x 25’
(7.62m)
UFD (Unassembled Flex Duct)
• HE x 10’
(3.05m)
AFD (Assembled Flex Duct)
• HE x 15’
(4.57m)
AFD (Assembled Flex Duct)
• HE x 25’
(7.62m)
UFD (Unassembled Flex Duct)
All configurations are available in both R4.2 and R8 R
Values.The 2”
(51mm)
and HE AFD come complete with the
necessary components for one complete ten foot or fifteen
foot branch run. The 25’
(7.62m)
UFD is to be used only to
extend these runs if needed.
If extending branch runs longer than the minimum,
contact the system designer, or reference
Table 03
for
branch duct losses on extended runs.
HE Duct is designed as a direct alternative for
two
2”
(51mm)
flex duct of the same length used in Hi-Velocity
Systems. No changes are required to fancoil selection and
main plenum duct sizing.
HE Duct utilizes the same selecting process as the
standard 2”
(51mm)
flex duct, a complete and comprehensive
heat loss/gain must be completed in order to select fancoil,
plenum size, and outlet quantities.
The HE Duct is designed
to directly replace two (2) standard 2”
(51mm)
outlets,
therefore when an area requires multiple outlets, a
single HE outlet can replace two of the standard 2”
(51mm)
ducts. Any combination of 2”
(51mm)
ducting, HE
ducting, and drilled outlets can be used, following the
minimum and maximum outlets as per unit selection.
HE Duct
Fig. 12 - Drill hole
Branch Take-Offs (BTO)
The locations for the Branch Take-Offs should be
determined before any drilling is done. Holes need to be
drilled a minimum of 6” apart on center
(152mm)
for 2” flex,
and 7”
(178mm)
apart on center for HE flex. Once all spots
are marked for the Branch Take-Offs, a hole saw is used
to drill the outlets - 2 1/4”
(57mm)
for 2”
(51mm)
Branch Take-
Offs and 3”
(76mm)
for HE Branch Take-Offs.
(Fig. 12)
.
Example: If a 3 Ton Unit has 24 outlets of the normal 2”
X 10’
(51mm)
flex duct, you can change to 12 HE X 10’ Duct
outlets, or 8 HE Duct and 8 2”
(51mm)
Duct outlets, or any
combination to give you the equivalent. See
Specification
& Sizing Pgs 1,2
for Air Flow data.
Flexible Duct
Duct Size
CFM Output
TWO
2” (51mm) Flex Duct
32 CFM X 2
(15 L/s X 2)
ONE
HE Duct
65 CFM
(31 L/s)
After all the holes have been drilled in the main plenum,
the Branch Take-Offs are then installed. The Branch Take-
Off is placed over the hole with the gasket in between
(Fig. 13a)
. The curvature of Branch Take-Off is aligned
so it matches the shape of the plenum. With the opening
fully over the hole push the BTO tight against the main
plenum and secure with four ¼”
(7mm)
self tapping screws
(Fig. 13b)
.
It is
NOT
recommended to connect any Branch Take-Offs
until all holes have been drilled, as it may be necessary to
rotate the plenum to drill the outlets.
Fig. 13a - Branch Take-Off
Fig. 13b - Securing
Module DUC
Installing Plenum and Branch Duct (4/9)
Module DUC Installing Plenum and Branch Duct (4/9)
Flexible Branch Duct
Table 03: De-rating Values
HE Series
Tubing Length
Adjustment Factor
10’
0%
15’
10%
20’
20%
25’
35%
Outside Diameters of Flexible Duct:
2” - R4 = 4.5” (114mm)
2” - R8 = 6.5” (165mm)
HE - R4 = 5.5” (140mm)
HE - R8 = 7.5” (191mm)