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NBK 20370-2 Aftermarket Condenser Fan Blade for Dometic Brisk Air RV A/C -- Replaces 3313107.015, 3107914.008, 317937.000
NBK 20370-2 aftermarket 6-blade condenser fan blade replacement for Dometic Brisk Air RV air conditioner, 10-1/2 inch diameter with 1/2 inch D-shaft hub
Replacement Dometic Air Conditioner Condenser Fan Blade For Brisk Air
  
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List Price: $49.49
: $30.73
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Part Number: 20370-2
Manufacturer: NBK Parts

Quantity in Stock :5

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NBK Parts Aftermarket Replacement 10-1/2" Diameter -- 6 Blade NBK 20370-2 -- Aftermarket Condenser Fan Blade for Dometic Brisk Air RV Air Conditioners

Restore full cooling performance to your Dometic Brisk Air rooftop air conditioner with the NBK 20370-2 -- a direct-fit aftermarket replacement for OEM part number 3313107.015. When a condenser fan blade cracks, chips, or loses a segment, the resulting imbalance causes vibration, noise, and reduced airflow that strains the fan motor and degrades cooling efficiency. The NBK 20370-2 matches the original 10-1/2" diameter, 6-blade polypropylene construction, and 1/2" D-shaft hub bore -- no drilling, no modifications, no adapter plates required. Also replaces OEM part numbers 3107914.008 and 317937.000.

Direct-Fit Condenser Blade That Stops Vibration and Restores Airflow

A damaged or out-of-balance condenser fan blade is one of the most common causes of excessive noise, reduced cooling output, and premature fan motor failure in Dometic Brisk Air rooftop units. The NBK 20370-2 is precision-molded to match the original blade geometry so airflow, pitch, and balance are restored immediately on installation -- no trial-and-error balancing or shimming.

NBK Parts produces this blade to the same dimensional spec as the Dometic OEM part, making it compatible with a wide range of Brisk Air A/C and heat pump models sold under both the Dometic and Duo-Therm brand names. If your unit currently carries part 3313107.015, 3107914.008, or 317937.000, the NBK 20370-2 is the confirmed replacement.

10-1/2" Blade Diameter

Matches original OEM sweep for full condenser airflow without modification.

6-Blade Design

Same blade count as the factory part -- maintains original CFM and motor load balance.

1/2" D-Shaft Hub

Fits the standard 1/2" D-shaft condenser fan motor used across Brisk Air platforms.

Replaces 3 OEM Numbers

Confirmed replacement for 3313107.015, 3107914.008, and 317937.000.

Confirmed Compatible Dometic / Duo-Therm Brisk Air Models

This blade is a verified replacement for the following Dometic and Duo-Therm Brisk Air model numbers:

  • 57912
  • 57915
  • 59136
  • 59146
  • 59156
  • 59516
  • 59530
  • B3351

If your Brisk Air model number is not listed, verify the OEM part number on your existing blade or wiring diagram against 3313107.015, 3107914.008, or 317937.000 before ordering.

What Is the Condenser Fan Blade and Why Does It Fail?

In a rooftop RV air conditioner, the condenser fan blade sits above the condenser coil and draws ambient outside air across the coil to reject heat. It runs continuously whenever the compressor is on. Common failure modes include:

  • Stress cracking from UV exposure and vibration over time
  • Impact damage from road debris, hailstones, or during removal of the A/C shroud
  • Hub bore wear that allows the blade to slip on the motor shaft
  • Missing or chipped blade tips that cause severe imbalance and motor strain

A cracked or unbalanced condenser blade does not self-correct -- replace it promptly to protect the fan motor.

Installation Notes

  • Confirm your condenser fan motor shaft is 1/2" D-profile before ordering -- some Brisk Air variants use a round shaft or a different diameter.
  • The blade mounts on the motor shaft with a set screw against the flat of the D-shaft. Torque the set screw snugly; do not over-tighten, which can crack the hub.
  • Inspect the condenser fan motor shaft and bearings while the blade is removed. A worn motor bearing is often the root cause of blade cracking from vibration.
  • Ensure the new blade spins freely without contacting the condenser coil or shroud before buttoning up the unit.
  • Always shut off A/C power at the breaker before working on any rooftop unit components.

Completing the Repair

If your Brisk Air unit has been running with a damaged blade for an extended period, also inspect:

  • The condenser fan motor for bearing noise or excessive current draw
  • The A/C shroud for stress cracks caused by vibration
  • The evaporator fan blade (a separate part) if airflow to the interior is also reduced

NBK and Dometic OEM replacement motors and evaporator blades for the Brisk Air line are available separately through rvupgradestore.com.

Part Identification

ManufacturerNBK Parts
NBK Part Number20370-2
Replaces OEM3313107.015
Also Replaces3107914.008, 317937.000
OEM BrandDometic / Duo-Therm
Part TypeCondenser Fan Blade (Aftermarket)

Physical Specifications

Blade Diameter10-1/2 inches (10.5")
Number of Blades6
Hub Bore1/2" D-shaft
MaterialPolypropylene
Hub RetentionSet screw on D-flat

Compatible A/C Model Numbers

Dometic / Duo-Therm57912
Dometic / Duo-Therm57915
Dometic / Duo-Therm59136
Dometic / Duo-Therm59146
Dometic / Duo-Therm59156
Dometic / Duo-Therm59516
Dometic / Duo-Therm59530
Dometic / Duo-ThermB3351

What Is Included

Included1x NBK 20370-2 condenser fan blade
Not IncludedFan motor, mounting hardware, evaporator blade, A/C shroud

Application

Unit TypeRooftop RV air conditioner / heat pump
FunctionCondenser section airflow (exterior)
Brands ServicedDometic, Duo-Therm (Brisk Air product line)

Important Information -- Read Before Installing

  • Disconnect power at the breaker before accessing any rooftop A/C components. Capacitors inside the unit can retain a charge even after power is cut -- allow several minutes before handling electrical components.
  • This blade is designed for the condenser (outdoor/exhaust) fan position only. It is NOT a replacement for the evaporator (indoor/return-air) fan blade, which is a separate part with different dimensions.
  • Verify your motor shaft is a 1/2" D-profile. Do not force the hub onto a mismatched shaft -- hub cracking will result.
  • Verify the OEM part number (3313107.015, 3107914.008, or 317937.000) on your existing blade before ordering if your model number is not listed above.
  • An imbalanced or cracked blade left in service will accelerate fan motor bearing wear. Replace damaged blades promptly.
  • This is an aftermarket part manufactured by NBK Parts and is not sold by or affiliated with Dometic Corporation.


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