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Lennox

OEM Lennox Air Filter — 71W20

SKU: LNX-71W20 Brand: Lennox
$19.95 $29.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 71W20 filter traps dust, pollen, lint, and airborne particles before they reach the blower, coil, and heat exchanger of your Lennox system. Beyond improving indoor air quality, it protects internal components from debris buildup that reduces airflow and efficiency, making it an essential part of routine Lennox maintenance.

A clogged or overdue 71W20 filter restricts airflow and can cause weak heating or cooling, longer run times, higher energy bills, a frozen evaporator coil, or nuisance shutdowns from an overheating system. Visible dust around vents and worsening allergies are common signs the filter needs replacing.

Using the OEM Lennox 71W20 ensures the correct dimensions, MERV rating, and airflow characteristics your equipment was engineered for. Ill-fitting aftermarket filters can bypass air around the edges or over-restrict flow, undermining performance and comfort. Keep genuine Lennox filters on hand and replace regularly to maintain clean air and peak system efficiency.

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 Filter fit my Lennox OEM Lennox Air Filter — 71W20?
Yes. This is the factory-specified OEM filter for the Lennox OEM Lennox Air Filter — 71W20. 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 filter on my Lennox OEM Lennox Air Filter — 71W20?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new filter?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this filter 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 filter?
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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Mike Rivera
HVAC Parts Specialist — Online