The Suburban 350110 is the OEM replacement combustion air wheel (also called a combustion impeller) for Suburban NT and P-series RV forced-air furnaces. This wheel mounts on the motor's short shaft inside the sealed combustion air box and is responsible for drawing fresh outside air into the combustion chamber and exhausting combustion gases to the exterior.OEM Suburban
Suburban NT-series furnaces are classified as Direct Vent Sealed Combustion units. The combustion air is completely isolated from your RV's living space. The motor drives two impeller wheels simultaneously – the combustion air wheel (this part) handles the intake and exhaust side, while a separate room air blower wheel circulates heated air through the duct system. Both wheels are critical to proper furnace operation, but they serve completely different functions and are not interchangeable.
This combustion wheel fits the following Suburban furnace models:
Suburban uses different combustion wheels for different NT furnace sizes. This wheel (350110) fits the larger NT-24 through NT-40 and P30S models listed above. If you have a smaller NT-series furnace (NT-12S, NT-16S, or NT-20S), you need Suburban 350082 instead. Using the wrong combustion wheel will result in incorrect airflow and unsafe furnace operation. Check your furnace model number on the data plate attached to your furnace before ordering.
1. Disconnect power – turn off furnace and disconnect 12V supply (or 120V for P30S) 2. Turn off gas supply – close the manual gas shut-off valve 3. Access the combustion side – remove the combustion air box cover or access the motor area 4. Remove the old wheel – loosen the clamp screw and carefully slide the wheel off the motor shaft 5. Inspect the motor shaft – check for wear, corrosion, or damage before installing the new wheel 6. Install new wheel – slide onto the motor shaft and secure with the included clamp 7. Verify clearance – ensure the wheel spins freely without rubbing the housing 8. Reassemble and test – restore power and gas, run furnace through a full heating cycle 9. Check combustion – verify proper flame appearance and that the furnace does not lock out
Suburban NT-series furnaces are Direct Vent Sealed Combustion units. The combustion air system is completely isolated from the room air system, even though both are driven by the same motor. The combustion wheel serves two critical functions:
The combustion wheel must supply the correct volume of air matched to the furnace's BTU rating. A damaged, dirty, or incorrect wheel will cause incomplete combustion, low flame sensor readings (below the required 7 microamps), and repeated furnace lockout. Regular inspection of the combustion wheel during annual furnace maintenance is recommended.
Suburban recommends inspecting the combustion wheel for lint, dust, and debris accumulation as part of regular furnace maintenance. A buildup on the wheel blades reduces airflow and can prevent the burner from operating correctly. Clean gently with a soft brush if needed, or replace if cracked or damaged.
If you have an NT-12S, NT-16S, or NT-20S furnace, you need Suburban 350082 instead. The combustion wheels are different sizes and are not interchangeable.
NT = NT Series Furnace (12V DC) P = Park Model (120V AC) 24/30/34/40 = BTU rating (×1000) BW = Bottom/Wall discharge SP = Side/Bottom ducted S = Standard
Suburban Manufacturing (Airxcel) Dayton, Tennessee