Dometic DF Serie Instructions D'installation page 9

PRE-INSTALLATION
C. Ducting
 Failure to obey the following warnings could result in property damage, serious injury, or death:
• Do NOT install floor registers within 24" of return-air openings .
• Do NOT use undersized ducting, which can cause high-temperature limiting .
• Do NOT use oversized ducting, which can cause inadequate air flow from the registers . When hard ducting is 1-1/2" in
depth, additional flex ducts may be needed to maintain air flow requirements .
• Hard ducting MUST be sealed to the Furnace and the floor .
• Spacing of 1/4" to ducting, within 3' of the Furnace, must be provided unless UL-listed, wire-bound, vinyl ducts are used .
All ducting material used must be rated for continuous use at a minimum of 200 °F .
• Floor registers must NOT be installed directly below the thermostat .
Setting Up The Return-Air Pathways
Keep all return-air passages clear to allow the Furnace to function properly . Make sure the total return-air opening size(s) meet
the clearance requirements specified in "A . Model Specifications" on page 4 and page 5 . Do NOT block the return
airflow path with ducting .
FIG. 1
RV Wall
Return-Air Vent
Identifying Duct Locations
Duct 2
FIG. 1
Duct 1
Duct 8
Duct 9
(Medium and Large Furnace)
FIG. 3
Duct 2
(Small Furnace)
Furnace
Duct 9
Duct 3
Duct 8
Duct 2
Duct 1
Duct 4
Duct 5
Duct 7
Duct 4
Front Discharge
Duct 1
Duct 3
FIG. 2
Duct 3
Duct 4
Duct 5
Vertical
Duct 6
Discharge
9
Bottom
Discharge