The Suburban 350184 is a genuine OEM replacement combustion air wheel for Suburban SF-25, SF-30, and SF-35 series RV furnaces. This wheel is responsible for supplying fresh air to the burner for combustion and forcing exhaust gases out through the vent.OEM SuburbanCombustion SidePlastic
Suburban RV furnaces use a sealed combustion system with two separate air channels – one for room air circulation and one for combustion. This combustion air wheel handles the combustion side, drawing air from outside through the intake tube and pushing exhaust gases out through the exhaust tube.
Combustion Air Wheel (This Part - 350184): • Pulls fresh air from OUTSIDE the RV through intake tube • Supplies combustion air to the burner • Forces exhaust gases OUT through the exhaust tube • Mounts on the SHORT shaft of the motor • Completely isolated from interior air Room Air Wheel (Different Part): • Pulls air from INSIDE the RV • Blows it across the sealed combustion chamber to absorb heat • Forces heated air back into living space • Mounts on the LONG shaft of the motor These two airflows are completely isolated from each other – combustion gases NEVER mix with your RV's interior air.
This combustion wheel fits the following Suburban SF series furnaces (25,000-35,000 BTU):
*SFV-42 can use either plastic 350184 or metal 350183
The SF-42 series (42,000 BTU) furnaces use the larger 350183 metal combustion wheel. The plastic 350184 will NOT fit SF-42, SF-42F, SF-42Q, or SF-42FQ models. Exception: The SFV-42 (vertical) can use either the plastic 350184 or metal 350183.
Suburban furnaces use a Direct Vent Sealed Combustion design for safety:
This sealed design means combustion gases never enter your RV – all exhaust is vented outside. The combustion air wheel is critical for maintaining proper airflow through this system.
A damaged or failing combustion air wheel can cause: • Incomplete combustion – carbon monoxide buildup • Poor exhaust flow – gases may back up • Ignition problems – insufficient air to burner • Furnace lockout – safety shutdown Always ensure proper vent cap installation and verify no obstructions in intake/exhaust tubes.
Before replacing the combustion wheel, inspect the exterior vent cap for: • Obstructions – wasp nests, debris, leaves • Damage – cracked or missing parts • Proper installation – intake and exhaust tubes properly connected A blocked vent cap causes the same symptoms as a bad combustion wheel and is easier to fix!
1. Disconnect all power – turn off furnace and disconnect 12V supply 2. Shut off propane – close tank valve 3. Access combustion chamber – remove necessary panels 4. Loosen set screw – locate on wheel hub 5. Slide wheel off motor shaft – pull straight off short shaft 6. Clean motor shaft – remove any debris or corrosion 7. Inspect combustion chamber – clean any soot buildup 8. Install new wheel – slide onto short shaft (combustion side) 9. Tighten set screw – secure but don't overtighten 10. Verify clearance – spin by hand, ensure no rubbing 11. Reassemble and test – verify proper operation and flame color
Some owners upgrade to the metal 350183 wheel for increased durability, though the plastic 350184 is the OEM specification for SF-25/30/35 furnaces.
*As of 1/2023, Suburban changed the part number to kit 521235
SF = Standard Furnace SFV = Standard Furnace Vertical 25/30/35/42 = BTU rating (×1000) F = Front Discharge Q = Quiet Operation VH = Vent Housing
Suburban Manufacturing (A division of Airxcel, Inc.) Dayton, TN USA Suburban pioneered the sealed combustion furnace design for RVs, ensuring safe operation by completely isolating combustion air from your living space.