York ZJ R-410A - Manual (Page 102)

251934-YTG-G-0708
102 Johnson Controls Unitary Products
ZJ/ZR/ZF180-300 Unit Accessory Dimensions
ZJ/ZR/ZF180-300 Roof Curb
ZJ/ZR/ZF180-300 Roof Curb Duct Openings
1. The 2” space between the ducts allows for “jumping” an
existing roof joist.
2. The 58-1/2” overall dimension of the ducts allows ductwork
penetration between roof joists that are spaced on 72”
centers.
NOTE: Ducts can be installed into the curb from the roof. All
electrical and gas line connections can be made inside
the curb.
ZJ/ZR/ZF180-300 Cut Away of Roof Curb
25-1/4"