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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

Comment

(mm)

Absolute minimum – ring must be

removed from top of plenum ducting.

Use plenum duct as provided

115

Absolute maximum

General

Roof less than 30mm – remove duct ring.

rule

30mm or thicker leave duct as supplied

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.

Note: Some installers ﬁ nd it easier to

attach the duct to the roof top unit ﬁ rst

and then insert the brace assembly.

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 ﬁ t.

Duct length

(mm)

120

150

Duct length =

Roof thickness + 35mm

Bolt length

Standard

Limit of std bolt

Installer to provide

Roof greater than 85mm thick will

require installer to provide longer bolts