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Lennox

OEM Lennox 20x25x24 Plenum with Cap & Flange 26G — X9794

SKU: LNX-X9794 Brand: Lennox
$18.95 $24.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The Lennox X9794 is a genuine OEM 20x25x24 plenum constructed from durable 26-gauge sheet metal, complete with cap and flange, designed to ensure efficient and balanced air distribution within compatible Lennox HVAC systems. A damaged or improperly sealed plenum can cause significant airflow imbalances, reduced system efficiency, increased energy costs, and uneven heating or cooling throughout the space. This direct OEM replacement from Lennox is manufactured to exact factory dimensions and specifications, guaranteeing a secure, airtight fit for optimal system performance.

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

Frequently Asked Questions

Does this Capacitor fit my Lennox OEM Lennox 20x25x24 Plenum with Cap & Flange 26G — X9794?
Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox 20x25x24 Plenum with Cap & Flange 26G — X9794. 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 capacitor on my Lennox OEM Lennox 20x25x24 Plenum with Cap & Flange 26G — X9794?
Difficulty: Easy (20–30 min)
Step 1: Turn off power at breaker. Step 2: Open condensing unit panel. Step 3: Photograph the old capacitor wiring (Common/Herm/Fan). Step 4: Discharge old capacitor with insulated screwdriver. Step 5: Disconnect and remove old capacitor. Step 6: Mount new capacitor, reconnect wires to matching terminals. Step 7: Close panel, restore power, test. Tools: screwdriver, needle-nose pliers.
My AC hums but won’t start. What part do I need?
An AC that hums but won’t start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost to start the compressor. When it fails, you hear humming but the motor can’t overcome inertia. Other symptoms: fan spinning slowly, AC cycling on/off rapidly, or a visibly swollen capacitor. Fix: replace capacitor ($15–$80 DIY, 30 min).
Is this capacitor 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 capacitor?
OEM strongly recommended. OEM capacitors have ±6% MFD tolerance vs aftermarket ±10%. The looser tolerance causes motor winding stress, higher temps, and shorter compressor life. Price difference is only $10–$20 — OEM is the clear value choice.
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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Mike Rivera
HVAC Parts Specialist — Online