York DM 300 - Manual (Page 35)

262259-YTG-E-1008
Johnson Controls Unitary Products 35
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 duct-
work 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.
FIGURE 10 -UNIT ROOF CURB DIMENSIONS
SUPPLY AIR*
BACK OF UNIT
RETURN AIR*
DUCT SUPPORT RAILS
MIN. ROOF OPENING:
39-7/8" WIDE X 61-7/8" Long
OUTDOOR COIL
END OF UNIT
4"
33-1/8"
2"
22-3/4"
4"
4"
84"
35-7/8" 14-1/4" (15 Ton)
25-1/4" (20, 25 Ton)
115-5/16" (15 Ton)
126-1/4" (20, 25 Ton)
2"
*Supply and Return Air (including duct support rails)
as shown, are typical for bottom duct applications.
For location of horizontal duct applications
(on back of unit), refer to Unit Dimension details.
FRONT
OF
UNIT
DUCT SIZES:
Supply Air = 22-1/2" x 35-5/8"
Return Air = 32-7/8" x 35-5/8"
FIGURE 11 -ROOF CURB DUCT OPENINGS
DIMENSION