Samsung SINGLE CNH ZDK Series Technical Data Book page 52

Installation
This appliance is approved for zero (0) inches clearance to combustible material on any part of the air handler exterior
casing and the inlet or outlet ducts providing NO electric heater is being used. There is a one (1) inch clearance on the
supply plenum and supply air duct when an electric heater is installed in the appliance. Refer to Table below for clearance
to combustibles information.
Top (inches)
0
* when electric heat kit accessory is installed
Return air requirements
Return Air Requirements
In order for the air handler to work properly, a closet or alcove must have a certain total free area opening for the return air.
For A/C and HP Air Handlers 1/3 HP Blower Motor
2
Minimum 200 in free area opening
For A/C and HP Air Handlers 1/2 HP Blower Motors
Minimum 250 in
For A/C and HP Air Handlers with Electric Heat use 3/4 HP Blower Motor
Minimum 390 in
minimum clearance between the appliance and the wall or door must be provided on the side where the return is located
Typical Closet Installations
Provisions shall be made to permit the air in the rooms and the living spaces to return to the air handler. Failure to comply
premature heating element failure (if electric heat kits are installed).
Back (inches) Sides (inches)
0 0
2 free area opening
2 free area opening
Closet Wall
Front of unit
Alcove (inches) Closet (inches)
30 6
0" 0"
Duct (inches)
1 *