13
PN 20009722 REV F, [08/01/2020]
DUCT CONNECTIONS
Attach branch duct and fresh air duct collars to cassette
chassis.
Install no more than 10 ft (3 m) of branch duct or fresh air
duct.
1.
Locate knock-out holes. See Figure 14.
Number of knockouts vary with unit size.
• Branch duct knock-outs are 5¼ in (133 mm) round.
• Fresh air knockouts are:
a.
1¼ x 2½ in (32 x 64 mm) rectangular models
08 - 12.
b.
3 in (76 mm) square models 18-36
2.
Cut black insulation around knock-out. See Figure 15.
3.
Snip tabs holding knock-out in place.
4.
Remove metal knock-out and black insulation.
5.
Attach field supplied duct collars to chassis using self-
drilling screws.
6.
Repeat above steps for remaining duct work.
Figure 14 - Knockouts
Figure 15 - Cut Insulation And Snip Out
Knockouts