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Upflow Furnace Models
UPFLOW APPLICATION
TOP
LEFT
SIDE
BOTTOM
UPFLOW/DOWNFLOW INSTALLATION CLEARANCES
Vent Connector
Standard Single
Type
Wall Metal Vent
LEFT SIDE
RIGHT SIDE
VENT
BACK
BOTTOM
TOP
FRONT
* For Downflow furnace installations only,
right side minimum clearance is 0".
**
For Downflow furnace installations only,
furnace must be installed on non-
combustible flooring.
***
Allow 24" minimum clearance for servicing.
The recommended clearance is 36".
10
RIGHT
SIDE
Type B-1 Double
Wall Metal Vent
0"
0"
5"*
0"
6"
1"
0"
0"
0"**
0"**
1"
1"
4"***
4"***
Table 3. Minimum Clearances to Combustible Material
HORIZONTAL APPLICATION
TOP
LEFT
SIDE
BOTTOM
HORIZONTAL INSTALLATION CLEARANCES
Vent Connector
Standard Single
Type
Wall Metal Vent
LEFT SIDE
RIGHT SIDE
VENT
BACK
BOTTOM
TOP
FRONT
***
Allow 24" minimum clearance for servicing. The
recommended clearance is 36".
Downflow Furnace Models
DOWNFLOW APPLICATION
LEFT
SIDE
BOTTOM
RIGHT
SIDE
Type B-1 Double
Wall Metal Vent
1"
1"
0"
0"
6"
1"
0"
0"
0"
0"
5"
0"
4"***
4"***
TOP
RIGHT
SIDE
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