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3. Preparation
Plan the location of the appliance and the warm air duct
runs. See Table 3.1.
WARNING! Risk of Fire!
• DO NOT fold/kink/pinch/obstruct 6 inch flexible ducts.
Appliance could overheat.
• Maintain 1 inch clearance around all sides of flexible duct.
AIR DUCT LENGTH
(Measurements in Inches)
SIZE
MIN.
36
28
48
28
60
28
72
28
*Additional flex duct required for longer runs.
Minimum of one inch clearance required around all
sides of flexible duct.
Table 3.1 Air Duct Length & Clearances
*Size 60 And 72 appliance models must use all 4 heat
management knock outs unless the addition of 1 alternate
heat management system is used (HEAT-OUT-GAS, HEAT-
ZONE-GAS) in conjuction with the ducted passive heat.
If alternate heat management systems are used with the
Ducted Passive Heat Kit (PHFR-MCE-XX), they must use
an outside heat management knockout location on the far
left or right of the appliance.
Hearth & Home Technologies • PHFR-MCE-36, PHFR-MCE-48, PHFR-MCE-60, PHFR-MCE-72 Instructions • 2560-972 • 6/20
MAX.*
DUCT Quantity
150
2
150
2
100
4*
100
4*
3
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