What HP motor do I need for my Lennox unit?

The correct replacement for Lennox model OEM Lennox Draft Inducer Blower Motor — 33H45 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Draft Inducer Blower Motor — 33H45.

My AC fan is not spinning. What part do I need?

A fan that does not spin, spins slowly, or makes grinding or squealing noises needs a new motor. Grinding means the bearings have failed. Squealing means the bearings are dry. No spin with a humming sound means the capacitor may be the issue. Check the motor capacitor before replacing the entire motor.

Lennox

OEM Lennox Draft Inducer Blower Motor — 33H45

Name: OEM Lennox Draft Inducer Blower Motor — 33H45
Brand: Lennox
SKU: LNX-33H45
Price: 159.95 USD
Availability: InStock

SKU: LNX-33H45 Brand: Lennox

$159.95 $219.95

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The genuine OEM Lennox 33H45 draft inducer blower motor drives the inducer assembly that pulls combustion gases through the heat exchanger and pushes them safely out the vent. It creates the negative pressure the pressure switch needs to confirm before ignition, making it essential to both safe venting and reliable furnace startup. This motor runs at the start of every heat call, priming the system for a clean burn.

Common failure symptoms include a loud humming, grinding, or rattling from the inducer, a furnace that won't ignite because the pressure switch never closes, intermittent no-heat calls, or pressure switch fault codes. Worn bearings, a seized motor, or reduced airflow are typical signs the 33H45 is failing.

Why OEM matters: The 33H45 is matched to your Lennox furnace for the correct RPM, airflow, and mounting fit needed to satisfy the venting design and pressure switch calibration. A genuine factory motor ensures proper draft, quiet operation, and long service life. Generic replacements may move too much or too little air, causing nuisance lockouts or venting problems. Choose the OEM 33H45 for a direct, trouble-free fit.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Lennox Draft Inducer Blower ...

$159.95

Frequently Asked Questions

Does this Fan Motor fit my Lennox OEM Lennox Draft Inducer Blower Motor — 33H45?

Yes. This is the factory-specified OEM fan motor for the Lennox OEM Lennox Draft Inducer Blower Motor — 33H45. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the fan motor on my Lennox OEM Lennox Draft Inducer Blower Motor — 33H45?

Difficulty: Medium-Hard (1–2 hrs)
Step 1: Turn off breaker. Step 2: Note motor specs: HP, RPM, voltage, rotation direction. Step 3: Remove old motor from mounting. Step 4: Transfer fan blade to new motor. Step 5: Mount new motor, reconnect wiring. Step 6: Restore power, verify rotation direction.

My AC fan isn’t spinning. What part do I need?

Fan not spinning, spinning slowly, or making grinding/squealing noises = motor failure. Grinding = bearings failed. Squealing = bearings dry. No spin + hum = check the motor capacitor first before replacing the entire motor.

Is this fan motor compatible with Bryant or Payne too?

Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Lennox fan motor?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Lennox Draft Inducer Blower Motor — 33H45

Shipping Information

Return Policy

Frequently Asked Questions