Unitary Products Group
7
035-19400-000-A-0403
FIG. 3
- CLEARANCES
3'
MINIMUM CLEARANCE OF 1"
ALL SIDES FOR THE FIRST 3'
OF DUCT FOR 20 & 25 kW.
ZERO INCHES THEREAFTER,
FOR ALL OTHER HEATERS,
ZERO INCH CLEARANCE ALL
SIDES FOR ENTIRE LENGTH
OF DUCT.
FLEXIBLE DUCT
COLLAR
DESCRIPTION
RESISTANCE, IWG
CFM
500
600
700
800
900
1,000 1,100 1,200 1,300 1,400 1,500 1,600 1,700 1,800 1,900 2,000
Wet Indoor coil
0.01
0.01
0.01
0.02
0.01
0.02
0.03
0.04
0.04
0.03
0.04
0.04
0.05
0.05
0.06
0.07
Economizer
0.00
0.00
0.00
0.01
0.01
0.01
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.07
0.08
0.08
Filter/Frame Kit
0.01
0.02
0.02
0.02
0.02
0.02
0.03
0.03
0.03
0.03
0.04
0.05
0.05
0.06
0.06
0.07
Electric Heat
0.02
0.03
0.03
0.03
0.04
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.01
0.11
0.11
0.12
NOTE: 1. Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.
2. The pressure thru the economizer is greater for 100% outdoor air then for 100% return air. If the resistance of the return air duct system is less then 0.25 IWG, the unit will deliver
less CFM during full economizer operation.
CLEARANCES
(Minimum)
Front
12"
Back
0"
Left Side (Filter Access) 24"
Right Side
24"
Below Unit
0"
Above Unit
36" (For Condenser
Air Discharge)
Q
Units may be installed on combustible floors made from wood or class A,
B or C roof covering material.
R
Units must be installed outdoors. Overhanging structures or shrubs
should not obstruct outdoor air discharge outlet.
NOTE: FOR UNITS APPLIED WITH A ROOF
CURB,THE MINIMUM CLEARANCE MAY BE
REDUCED FROM 1 INCH TO 1/2 INCH BE-
TWEEN COMBUSTIBLE ROOF CURB MA-
TERIAL AND THE SUPPLY DUCT.
TABLE 7 -
ADDITIONAL STATIC PRESSURE RESISTANCE
