When the fan motor in your Dometic Brisk Air II quits, you have two options: pay OEM prices for the Dometic 3315332.005, or get the NBK 20435 – an aftermarket replacement built to the same specifications at a lower cost. NBK (a division of National Electrical Bearing) manufactures HVAC motor replacements to the original equipment dimensions and performance ratings, making the 20435 a true drop-in fit for the Brisk Air II without any drilling, rewiring, or bracket modification.AftermarketDirect-FitReplaces OEM 3315332.005
The fan motor is the heart of the Brisk Air II's airflow system. It drives two separate loads: the condenser fan blade on the roof (which exhausts heat from the refrigerant coils outside the RV) and the evaporator blower wheel inside the shroud (which circulates cooled air through the RV interior). When this motor fails, both functions stop – resulting in no cooling and a hot RV. The NBK 20435 restores both functions with a single, correctly rated replacement.
Matches OEM power and voltage specs exactly
High, medium, and low speed control
Quiet, reliable, low-maintenance motor type
OEM-spec performance at lower cost
The NBK 20435 uses a shaded pole motor design – the same type as the original Dometic and Genteq units it replaces. Shaded pole motors generate rotation through a rotating magnetic field driven by the AC power source rather than brushes, commutators, or capacitors (the motor runs with an external run capacitor, sold separately). This results in several practical advantages for RV air conditioner use:
The 20435 features two D-profile output shafts — one on each end of the motor body. This dual-shaft configuration is specific to Brisk Air II units, where the motor simultaneously drives two separate components:
Both shafts are D-profile (flat-cut) to match the keyway in the fan blade and blower wheel hubs, preventing slippage under load. Make sure the set screws on both the condenser fan blade and evaporator blower wheel are properly tightened to the flat of the shaft during installation.
The NBK 20435 is confirmed compatible with the following Dometic Brisk Air II rooftop A/C units: • B57915 (.711C0 and .711J0) • B59146 (.711C0 and .711J0) • B59186 (.711C0 and .711J0) • B59196 (.711C0 and .711J0) • B59516 (.711C0 and .711J0) • B59530 (.701C0 and .701J0) Also replaces: Dometic 3315332.005 (OEM) and Genteq F48AF70A61 Always verify your existing A/C unit's model number on the data label (typically inside the rooftop shroud) before ordering to confirm compatibility.
The NBK 20435 comes with pre-terminated wire leads that match the original motor's connection configuration:
The bullet-type terminals on the speed leads match the existing connector configuration in Brisk Air II units, allowing direct plug-in reconnection without splicing, crimping, or rewiring.
Run Capacitor Required (Not Included): This PSC-type motor requires an external run capacitor rated 5 mF × 370VAC (sold separately). If your existing capacitor tests good, it can be reused. A failed capacitor is a common cause of motor failure and should be tested or replaced whenever the motor is changed. Fan Blade and Blower Wheel Not Included: The motor is supplied without the condenser fan blade or evaporator blower wheel. Reuse your existing components if they are in good condition, or replace as needed (NBK 20435-1 for condenser fan blade, NBK 20435-2 for evaporator blower wheel). Shaft Set Screws: When reattaching the condenser fan blade and blower wheel, tighten set screws firmly against the D-flat on each shaft to prevent slippage under load. Mounting: Side-mount configuration matches Brisk Air II mounting bracket holes at 2-3/8" spacing. Use existing mounting hardware.
The Dometic part number 3315332.005 applies to the complete motor assembly including mounting style and connection configuration. If you are replacing a motor whose Genteq number matches (F48AF70A61), that does not by itself guarantee that the mounting style and connection style will match your specific unit. Always confirm the full Dometic model number of your A/C unit against the compatibility list above before installation. If unsure, locate the data label on your Brisk Air II shroud and confirm the model number matches one of the compatible models listed.
• A/C runs (compressor cycles) but no air flows from interior vents • Loud humming or buzzing from rooftop unit with no fan movement • Motor runs hot and shuts off on thermal overload • Fan blade or blower wheel spins freely by hand but won't start under power • Burning smell from the rooftop unit • One or more speed settings non-functional • Visible corrosion, cracked windings, or physical damage to motor body
When replacing the fan motor, inspect and consider replacing: Run Capacitor – A failed or weak capacitor is a leading cause of motor burnout. Always test or replace when changing the motor. Condenser Fan Blade (NBK 20435-1) – Check blades for cracks, chips, or warping that could cause imbalance and vibration on the new motor. Evaporator Blower Wheel (NBK 20435-2) – Inspect for debris buildup or damage to the squirrel cage that could restrict airflow or unbalance the new motor.
• Disconnect shore power and battery before servicing – The rooftop A/C unit operates on 115V AC; always disconnect all power before accessing the motor • Verify A/C model compatibility before ordering – Confirm your Brisk Air II model number matches the compatibility list; do not rely solely on matching Genteq numbers • Run capacitor required – This motor will not start without a properly rated 5 mF × 370VAC run capacitor; always test the existing capacitor before reusing it • Aftermarket product – This is an NBK aftermarket replacement, not a Dometic OEM part; it is not manufactured by or affiliated with Dometic/Waeco • Set screws must be tightened to D-flat – Both condenser fan blade and evaporator blower wheel must be secured firmly to the shaft D-flat to prevent slippage and potential fan blade detachment