Attach branch duct and fresh air duct collars to cassette
chassis using following steps.
Recommend install no more than 10 feet (3m) of branch
duct or fresh air duct.
1.
Locate knock-out holes. See Figure 12 .
Number of knockouts vary with unit size.
• Branch duct knock-outs are 5¼” (133mm) round.
• Fresh air knockouts are:
a. 1¼” x 2½” (32 x 64mm) rectangular models 9
& 12.
b. 3” (76mm) square models 18 & 24
3.
Cut black insulation around knock-out. See Figure 13 .
4.
Snip tabs holding knock-out in place.
5.
Remove metal knock-out and black insulation behind
it.
6.
Attach fi eld supplied duct collars to chassis using self-
drilling screws.
7.
Repeat above steps for remaining duct work.
Figure 12 - Knockouts
Fresh Air
Knockout
Branch Duct Knockout
Cassette 9-12
Cassette 9-12
CASSETTE 18 -24
CASSETTE 18 -24
Figure 13 - Cut Insulation And Snip Out
Knockouts
DUCT CONNECTIONS
13
