© 1995-2009 Energy Saving Products Ltd.
Location
When locating the plenum duct, one of the main factors
to consider is the integration of the duct work into the
structure. The main supply duct can be located along the
main beam(s) in the basement
(Fig. 01)
.
Fig. 01 - Basement installation
Min. 18”
(457mm)
The main plenum can also be easily installed in the attic
space.
(Fig. 02)
Fig. 02 - Attic Installation
18”
(457mm)
If the unit is installed in the attic, make sure that all ducts
in the attic are insulated with a vapour barrier (All A/C
systems main plenums need to be insulated and vapour
barriered, check with local codes for required R-Value).
This includes the Branch Take Off and the vent Rough-In
Boot. All main plenum and flex runs should be installed
under
the attic insulation. If the duct work is run above
the attic insulation, an extra insulation sleeve may be
needed. Check your local building code for the ruling in
your area.
For any duct runs over 75% of the maximum allowable
plenum length
(Module SPC - Specifications and
Sizing Pgs. 1, 2)
,
it is recommended to insulate the main
plenum. Insulating the main plenum will cut down on your
duct loss, and form a vapour barrier. The attic insulation
should be placed over all Hi-Velocity System ducts to
further reduce any duct losses.
Main Plenum Connectors
There are five types of connections that are possible
with the Hi-Velocity System.
All the connections are done as follows. Place the joint
connector, cap, tee, or elbow inside the plenum you intend
to connect. Push the plenum over the fitting as tight as
possible. Use four screws on each side of the connector,
alternating the screw locations as indicated in
Fig. 04
.
Fig. 03 - Connectors
1. Tee Connection
2. Elbow Connection
3. Reducers
4. End Cap
5. Straight Connection
Fig. 04 - Alternating screw locations
Elbow and Tee Placement
Elbows and tees must not be placed any closer than 18”
from supply outlet on the air handling unit. A significant
loss of airflow can result if elbows or tees are installed
closer than 18”
(457mm)
.
Figs. 06
and
Fig. 07
illustrate a
proper install with at least 18” of straight plenum after the
unit supply outlet.
Fig. 05
shows the sigma velocity profile
of the first 18”
(457mm)
of the main plenum and why it’s
important to allow the system to equalize air flow.
IF THE DUCT IS LOCATED IN AN UNCONDITIONED
AREA, INSULATING SLEEVE IS REQUIRED ON
THE MAIN PLENUM. IF USED FOR COOLING, IT IS
ALSO RECOMMENDED TO INSULATE AND VAPOR
BARRIER THE MAIN PLENUM AND FLEX DUCT
FITTINGS. INSULSLEEVES ARE AVAILABLE AS AN
ACCESSORY IN R4.2 FOR 6’
(1.83m)
, 8’
(2.44m)
FOR 10’
(3.05m)
PLENUMS IN 10’
(3.05m)
LENGTHS.
Flexible duct is NOT to be
used for supply air plenum.
Plenum Duct
Module DUC
Installing Plenum and Branch Duct (1/9)
Module DUC Installing Plenum and Branch Duct (1/9)
Insul-Sleeve
over plenum
