Installation guide

Sparrow Mk4 Installation Guide 20
th
Dec 2012 Page 9 of 14
6. ASSESS ROOF THICKNESS
- Measure the roof thickness and
consult the table across to check
if adjustments to the duct length
are required.
- NOTE if the duct length needs
to be adjusted then cut the
excess from the un-notched end.
Roof thickness
(mm)
Comment
Duct length (mm)
Bolt length
25
Absolute minimum – ring must be
removed from top of plenum ducting.
60
Standard
30
Use plenum duct as provided
65
Standard
40
“
75
Standard
50
“
85
Standard
60
“
95
Standard
85
“
120
Limit of std bolt
115
Absolute maximum
150
Installer to provide
General rule
Roof less than 30mm – remove duct
ring. 30mm or thicker leave duct as
supplied
Duct length = Roof
thickness + 35mm
Roof greater than 85mm
thick will require installer
to provide longer bolts
7. ASSEMBLE DUCT
- Thread a hold down bar onto
the M8 bolt and push the bolt
almost all the way into the hole
in each corner of the brace
(Fig 9)
- Leave a 10mm gap between the
hold down bar and the recess in
the plastic brace. This will allow
for easier engagement with the
four corresponding threaded
holes in the unit.
- Turn the assembly over and add
the black plastic duct work to the
top of the assembly with the
notch upwards (Fig 10). The
notch is shown circled below.
- Align the notch with the inside
fans power cable.
When attaching the
duct to the unit take
care to ensure it forms
a tight, unbroken seal that
doesn’t allow cold air to escape.
Fig 9: Insert the four M8 bolts and hold down bars into the corners of the brace
Fig 10: Fit the black plastic duct onto the brace assembly ensuring a tight, sealed fit