Connecting The Ducts To The Unit - Broan HRV90T Installation Manual

4. I
( '
NSTALLATION
CONT
4.5 C
ONNECTING THE
NOTE: All units ports were created to be connected to ducts having a minimum of 4" diameter, but if need be, they can be connected
to bigger sized ducts by using an appropriate transition (e.g.: 4" diameter to 5" diameter transition).
Insulated flexible ducts
Use the following procedure to connect the insulated flexible ducts to the ports of the unit (Exhaust air to outdoors and Fresh air
from outdoors ports).
All units have those 2 ports equipped with integrated balancing damper. Prior to install the
insulated flexible ducts, ensure these both ports have their damper entirely open (their
adjusment pin (A) must be set vertical, as shown at right).
If ducts have to go through an unconditioned space (e.g.: attic), always use insulated ducts.

Pull back the insulation to expose the flexible duct.

Attach the flexible duct to the port using tie wrap.

Pull the insulation over the joint and tuck in between the inner and outer rings of the double collar.

Pull down the vapor barrier (shaded part in illustrations below) over the outer ring to cover it completely. Fasten in place the vapor
barrier using the port strap included in unit parts bag). To do so, insert one collar pin through vapor barrier and first strap hole, then insert
the other collar pin through vapor barrier and center strap hole and close the loop by inserting the first collar pin in the last strap hole.
Make sure the vapor barrier on the insulated ducts does not tear during installation to avoid condensation
within the ducts.
)
D
D U
UCTS TO THE NIT
1
3
VJ0074
Non-insulated rigid ducts
Use metal screws and duct tape
to connect the rigid ducts to the
unit ports.
VJ0073
CAUTION
CAUTION
2
4
C
OLLAR PIN
Non-insulated flexible ducts
Use tie wraps to connect the flexible
ducts to the unit ports.
9
VJ0033
C
OLLAR PIN
A