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Dometic 3310709.005 Condenser Fan Blade for Brisk II RV Air Conditioners -- 10.5" Diameter Direct Replacement
Dometic 3310709.005 black condenser fan blade for Brisk II RV air conditioner, 10.5-inch diameter with D-shaped 1/2-inch shaft hole
Dometic Condenser Fan Blade For Brisk II Air Conditioners - Direct Replacement
  
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Part Number: 3310709.005
Manufacturer: Dometic

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Dometic Direct Replacement 2-Year Warranty Dometic 3310709.005 Condenser Fan Blade for Brisk II Air Conditioners

Restore proper condenser airflow in your Dometic or Duo-Therm Brisk II rooftop air conditioner with this OEM-spec replacement fan blade. Engineered to fit 12 specific Brisk II model numbers exactly, this blade snaps onto the D-shaped motor shaft with no modifications required -- keeping your rig cool without a service call.

The Right Blade for Your Brisk II -- No Guesswork Required

A damaged or cracked condenser fan blade is one of the most common causes of reduced cooling performance and compressor overheating in rooftop RV air conditioners. When the condenser side can't move air efficiently, the entire refrigerant cycle suffers. Replacing the blade promptly is a straightforward DIY repair that protects a far more expensive compressor.

Part number 3310709.005 is the Dometic OEM-specified condenser fan blade for the Brisk II product line. It is also cataloged under NBK part number 20435-1. The blade measures 10-1/2 inches in diameter and 3 inches in depth, and uses a D-shaped 1/2-inch shaft hole that locates positively on the motor shaft -- no set-screw alignment guessing.

OEM-Spec Dimensions

10-1/2" diameter x 3" depth matches the original blade geometry for correct airflow volume and balance.

D-Shaft Fit

D-shaped 1/2" shaft hole seats positively on the condenser motor shaft -- no slipping or vibration.

Verified Fitment

Confirmed for 12 specific Brisk II model numbers. Check your unit's label before ordering.

2-Year Warranty

Backed by Dometic's limited 2-year manufacturer warranty for defects in materials and workmanship.

Condenser vs. Evaporator -- Make Sure You Need This Blade

Brisk II units contain two fan assemblies: the condenser fan (top/outdoor side, draws air over the condenser coil) and the evaporator/blower (indoor side, circulates cabin air). Part 3310709.005 is the condenser fan blade only. If your indoor airflow is the issue, a different part number applies. Inspect the outdoor shroud area when the unit is powered off to confirm which blade is cracked, bent, or missing.

Direct-Replacement Fit: This blade is dimensionally identical to the factory-installed part on all 12 listed Brisk II models. No drilling, cutting, or adapter hardware needed. Slide onto shaft, secure the retaining nut, and reinstall the shroud.

Compatible Brisk II Model Numbers

Verify your model number on the rating label affixed to the unit (typically on the indoor ceiling assembly or the outdoor shroud). This blade fits the following Dometic and Duo-Therm Brisk II models:

  • B57915.711C0
  • B57915.711J0
  • B59146.711C0
  • B59146.711J0
  • B59186.711C0
  • B59186.711J0
  • B59196.711C0
  • B59196.711J0
  • B59516.711C0
  • B59516.711J0
  • B59530.701C0
  • B59530.701J0

If your model number does not appear on this list, do not assume compatibility. Dometic produces several Brisk II variants with different fan blade specifications.

Also Cataloged As: NBK part number 20435-1. If you sourced this part number from a repair manual or parts diagram, this is the correct blade.

Installation Overview

Condenser fan blade replacement on the Brisk II is a rooftop job. General steps:

  • Disconnect shore power and switch off the AC breaker before going on the roof.
  • Remove the outdoor shroud (typically 4-6 screws around the perimeter).
  • Remove the retaining nut from the condenser motor shaft -- note that some Dometic motors use reverse (left-hand) threads on the condenser shaft nut.
  • Pull the old blade straight off the shaft. Inspect the motor shaft and bearings while the blade is off.
  • Slide the new blade onto the D-shaft, confirm orientation (blade pitch should direct airflow upward/outward), and torque the retaining nut snugly.
  • Reinstall the shroud and restore power. Verify smooth, wobble-free rotation before leaving the roof.
Maintenance Tip: Inspect fan blades each season when you clean the condenser coil. Hairline cracks at the hub or bent blade tips cause vibration that accelerates motor bearing wear. Catching a cracked blade early is far cheaper than replacing the condenser motor.
Heads Up -- Retaining Nut Thread Direction: Some Dometic Brisk II condenser motors use a left-hand (reverse) thread on the shaft retaining nut to prevent loosening during operation. Attempting to remove it clockwise may strip the nut. Confirm thread direction before applying force.

Part Identification

Dometic Part Number3310709.005
NBK / Vendor Part Number20435-1
ManufacturerDometic (formerly Duo-Therm)
Product LineBrisk II Rooftop Air Conditioner
Component TypeCondenser Fan Blade
WarrantyLimited 2-Year Manufacturer Warranty

Physical Specifications

Blade Diameter10-1/2" (10.5 inches)
Blade Depth3 inches
Shaft Hole ShapeD-shaped (flat-sided)
Shaft Hole Size1/2 inch
ColorBlack
Weight0.5 lbs

Compatible Models

Model 1B57915.711C0
Model 2B57915.711J0
Model 3B59146.711C0
Model 4B59146.711J0
Model 5B59186.711C0
Model 6B59186.711J0
Model 7B59196.711C0
Model 8B59196.711J0
Model 9B59516.711C0
Model 10B59516.711J0
Model 11B59530.701C0
Model 12B59530.701J0

What Is Included

In the Box1x condenser fan blade
Retaining NutNot included -- reuse existing hardware
HardwareNo additional mounting hardware included

Application Notes

Fan LocationOutdoor/condenser side (rooftop shroud)
Installation LocationRooftop -- requires roof access
Tools RequiredNut driver or socket set, screwdriver for shroud
Important Information
  • Verify your Brisk II model number against the 12 listed models before purchasing. This blade does not fit all Dometic or Duo-Therm rooftop AC units.
  • This is the condenser (outdoor) fan blade only -- it does not replace the indoor evaporator blower wheel.
  • Retaining nut is NOT included. Reuse the existing nut, or source separately if damaged. Some units use reverse (left-hand) thread nuts.
  • Always disconnect shore power and turn off the AC circuit breaker before removing the outdoor shroud or touching any internal components.
  • Confirm blade pitch orientation before torquing the retaining nut. Reversed blade pitch will dramatically reduce condenser airflow and can cause compressor failure.


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