© 1995-2009 Energy Saving Products Ltd.
Fig. 10 - Use an End Cap or Reducer
After the insulation sleeve is installed, cut an X through
the vapour barrier and insulation. Peel it back enough
to allow you to drill your hole without ripping all of the
insulation. Install the branch take-off as described in the
Branch Take-Off section.
To install the insulation sleeve over the main
plenum, either tape the end of the duct or use an
end cap. This will allow the sleeve to slide on easier,
and prevent the insulation from catching on the sharp
metal ends of the duct
(Fig. 10)
.
Fig. 11 - BTO with insulation sleeve
Branch Take-Off with Insulation Sleeve
Connecting Plenum to Fan Coil
After the main plenum duct and the fan coil unit
are in place, they can be fitted together. Do not
permanently fasten the two together yet, as the
plenum may need to be rotated in order to make
the branch take-off connections. Once rotated into
position, fasten and seal with duct sealant or foil
duct tape.
In some installations, it is necessary to reduce the
size of the main plenum. Caution must be used when
reducing plenum size, since smaller ducts can handle
less number of outlets. Also, when running the plenum
duct past 75% of max distance, it is best to keep full
size plenum duct to reduce restriction in the main
plenum. Keep in mind that once reduced, the main
plenum cannot be increased again. The Branch Take-
Offs form easily to ducts in the 6”
(152mm)
to 8”
(203mm)
range; extra care must be taken with smaller sized
ducts to ensure a proper air seal. For tee reductions,
keep the tee to the full duct size, if reducing the plenum
duct, reduce only after the tee. Keep the length of the
smaller duct sizes to a minimum, since the friction loss
is much higher. If a hole saw will be used to drill the
Branch Take-Off holes, metal ducts are recommended
to be 28 gauge steel.
Duct Reductions
Table 02 – Duct Reduction
Duct
Size
# of 2”
(
51mm
)
Vents
# of Vents
(HE)
Max
Length
4”
(102mm)
4
N/A
30’
(9.14m)
5”
(127mm)
6
3
40’
(12.19m)
6”
(152mm)
12
6
50’
(15.24m)
7”
(178mm)
19
9
60’
(18.29m)
8”
(203mm)
29
14
70’
(21.33m)
10”
(254mm)
48
24
100’
(30.48m)
Module DUC
Installing Plenum and Branch Duct (3/9)
Module DUC Installing Plenum and Branch Duct (3/9)
