Frigidaire PureAir Ultral Replacement Refrigerator Air Filter packaging with filters displayed.

Frigidaire FFTR1821TW Refrigerator Replacement Air Filter

1 Pack
$12.99 USD $18.49 USD
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Frigidaire PureAir Ultral Replacement Refrigerator Air Filter packaging with filters displayed.
  • Frigidaire PureAir Ultral Replacement Refrigerator Air Filter packaging with filters displayed.
  • Frigidaire PureAir Ultralll refrigerator air filter packaging on a white background
  • Rectangular white object with three black rectangular pads on a white background
  • Hand installing a refrigerator filter with 'Frigidaire' branding and text 'Easy install, No tools required.'
  • Hand reaching towards a PureAir Ultra II filtration system inside a refrigerator.
  • Fridge with food items and Frigidaire advertisement on a white background
Frigidaire FFTR1821TW Refrigerator Replacement Air Filter

Frigidaire FFTR1821TW Refrigerator Replacement Air Filter

Your Frigidaire 18 Cu. Ft. Top Freezer Refrigerator Model FFTR1821TW uses PAULTRA2 replacement air filter
$18.49 USD $12.99 USD
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The Frigidaire refrigerator model FFTR1821TW air filter replacement helps reduce fridge odors and maintain a cleaner food storage environment. The PAULTRA2 filter's activated carbon media absorbs odor-causing particles from onions, garlic, seafood, leftovers, and other common foods before they spread throughout the refrigerator compartment. This helps reduce odor transfer and supports the freshness of fruits, vegetables, beverages, dairy products, and prepared meals.

The replacement air filter for Frigidaire FFTR1821TW offers dependable odor control and easy installation in compatible refrigerators using the PureAir Ultra II filtration system. Regular replacement helps maintain cleaner air circulation and effective odor absorption. Changing the filter every six months supports optimal performance and long-lasting freshness. Order your replacement filter today and enjoy a fresher refrigerator environment — browse our full range of refrigerator air filters for cleaner air and better protection for your favorite foods.

Frigidaire PureAir Ultra II (PAULTRA2) replacement refrigerator air filter is compatible with model FFTR1821TW

Frigidaire PureAir Ultral Replacement Refrigerator Air Filter packaging with filters displayed.

Key Features

  • Active Carbon Absorption: Chemically traps and permanently neutralizes intense food odors at a molecular level instead of masking them.
  • 15x Faster Than Baking Soda: Integrates directly with internal fan loops to actively scrub air channels rather than relying on passive absorption.
  • Flavor Shield Protection: Traps airborne gases so sensitive items like fresh milk, butter, and open ice trays never absorb leftover smells.
  • High-Capacity Wave Profile: Accordion-style corrugated layout maximizes active surface area for maximum odor retention in a compact frame.
  • 6-Month Lifespan Performance: Delivers continuous, heavy-duty odor elimination for up to 180 days before needing a quick, tool-free swap.

Specifications

  • Brand: Frigidaire / Electrolux
  • Part Number: PAULTRA2 (242047805)
  • Filter Type: Refrigerator Air Deodorizer
  • Filter Media: Advanced Activated Carbon Block
  • Physical Dimensions: Approximately 3.8" x 1.8" x 0.4"
  • Replacement Frequency: Every 6 months (180 days)
  • Installation Design: Slide-in toolless channel fit
  • Compatible Appliance Model: Frigidaire FFTR1821TW
How LG LT120F Works: Diagram of an advanced 3-layer air filtration system with labeled layers and particle removal.

How It Works

The air filter uses activated carbon technology to continuously circulate and purify the air inside your refrigerator — neutralizing odors from foods like fish, leftovers, and produce before they spread or affect flavor.

  • Activated Carbon Core: Uses a dense carbon matrix to adsorb odor molecules and gases on contact.
  • Continuous Air Circulation: Works with your fridge's fan to pull air through the filter repeatedly, 24/7.
  • Adsorption Technology: Traps contaminants at a molecular level rather than just masking smells.
  • Passive Filtration: Requires no maintenance between replacements—install, and it works automatically.

Why It Matters

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Odor Control

Prevents food odors from spreading and mixing inside your refrigerator.

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Freshness Protection

Removes ethylene gas that accelerates the spoilage of fruits and vegetables.

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Food Safety

Inhibits airborne bacteria and mold spores from contaminating stored food.

Why It Matters — Fresh Refrigerator Interior
What LG LT120F Filter Removes: Diagram showing how to remove tough food odors with volatile organic compounds and airborne impurities.

What This Filter Removes

Our certified filtration system targets and removes a wide range of harmful contaminants and odors.

  • Food Odors: Neutralize strong smells from fish, leftovers, onions, and other pungent foods.
  • Ethylene Gas: Absorbs the natural gas emitted by ripening produce that speeds up spoilage
  • Airborne Bacteria: Captures and reduces bacteria circulating in the air inside your fridge.
  • Mold Spores: Filters out mold spores before they can settle and grow on stored food
  • Volatile Organic Compounds (VOCs): Remove harmful chemical compounds that can affect food quality.
  • Cross-Contamination Particles: Prevents flavor and odor transfer between different food items.

When to Replace Your Refrigerator Air Filter

Person marking calendar in kitchen

Every 6 Months

Activated carbon saturates over time. Replacing every 6 months ensures continuous odor and gas adsorption — even if the filter looks clean.

Fridge control panel

Filter Alert Light

When your fridge's air filter indicator turns red or begins flashing, replace immediately. The sensor tracks usage and airflow performance automatically.

Persistent Fridge Odors

Persistent Fridge Odors

If odors linger inside a clean fridge, your air filter is exhausted. Don't wait for the indicator — trust your nose and replace it promptly.

See which water and air filter is compatible with your refrigerator.

Find Compatible Models

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FAQ

Q: Which air filter does the Frigidaire model FFTR1821TW refrigerator use?
A: Your Frigidaire refrigerator uses the PureAir Ultra II (PAULTRA2) air filter, which helps reduce food odors and keeps the refrigerator smelling fresh.

Q: Can I use baking soda instead of an air filter?
A: While baking soda may absorb some odors, the PureAir Ultra II filter actively filters circulating air and is designed to provide more effective odor control inside the refrigerator. Browse our full range of Frigidaire air filters for the right fit for your model.

Q: What happens if I don't replace the air filter?
A: An expired filter may lose its ability to absorb odors effectively, allowing strong food smells to spread throughout the refrigerator and affect the freshness of other items.

Q: Can I wash and reuse the FFTR1821TW filter?
A: No. This is a disposable filter and should be replaced when it reaches the end of its service life. Shop replacement packs in our refrigerator air filter store.

Q: How to replace the Frigidaire FFTR1821TW air filter?
A: Replacing the filter is simple and tool-free. Open the refrigerator, locate the filter housing, remove the old filter, and insert the new one. If your refrigerator has a filter indicator, press and hold the Air Filter or Reset Filter button for a few seconds to reset it. For a full walkthrough, see our complete air filter replacement guide.

Q: What happens if I don't replace the air filter?
A: An expired filter may lose its ability to absorb odors effectively, allowing strong food smells to spread throughout the refrigerator and affect the freshness of other items.