3. Units surrounded on all four sides:
A. If installed unit(s) is / are surrounded by 2 walls and a solid fence, fence height on two sides shall be
no higher than the height of the unit. In this application knockouts or louvers shall be provided on two
sides minimum with free area to provide maximum 300 FPM velocity. Cutting a portion of the lower
fence on two sides to accomplish 300 FPM maximum velocity is acceptable provided debris, dirt, and
grass is prohibited from accumulating or growing to obstruct the opening. Refer to page 19 of this
document for outdoor unit airflow. Please refer to table below for minimum clearances.
A
A
A
A
A
Service
Clearance*
Service
Clearance*
A
A
A
A
A
A
2B
2B
2B
A
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
SIngle Unit - Solid Fence
Multiple Units Solid Fence
Solid Fence: If fence height is taller than unit(s), provide openings in fence that will provide maximum 300 FPM air velocity.
These openings shall be located at the lower portion of the fence. If acceptable, the fence may be raised to provide open
bottom clearance of fence height above the unit.
Service Clearance*
minimum clearance table
* If removable panels are used and acceptable to local inspection agency, the clearance to the removable
panel may be reduced to (1.5 X A)
These clearances apply in geographical locations in which the
maximum design outdoor dry bulb = 105F or less.
The measurement 2B indicates to multiply the dimension B
from the minimum clearance table by 2 in order to determine
the approprieate minimum distance between units.
5 feet minimum top clearance shall be provided.
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opening size @
300 FPM maximum
velocity
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