York DM 300 User Manual

262259-YTG-B-0107

Unitary Products Group

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.

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"