Buying Guide: How to Choose and Replace HEPA Filters for Lasko Tower Air Purifiers

Quick Recommendation

For Lasko tower air purifiers, the B‑Air AS‑HF Stage 2 HEPA filter (2‑pack) is a proven compatible choice. Replace the filter every 6‑12 months and always swap the pre‑filter at the same time to maintain optimal capture of particles down to 0.3 microns.

Keeping the air in your home fresh hinges on using the correct HEPA filter for your Lasko tower purifier. A mismatched filter can reduce airflow, shorten device life, and let pollutants slip through.

This guide walks you through the key decisions—size, efficiency, and replacement schedule—so you can protect your indoor air quality without guesswork.

1. Identify the Correct Filter Size

Lasko tower air purifiers are designed for specific filter dimensions. Check the model’s user manual or the label inside the filter compartment for the exact size (usually expressed in inches or millimeters). If the size is missing, the lack of specification limits our ability to recommend a universal fit, so contact Lasko support before purchasing.

When you have the dimensions, compare them to the B‑Air AS‑HF Stage 2 filter specifications. This filter is engineered to fit standard Lasko scrubber housings and seals tightly to prevent air bypass.

• Measure width, height, and depth of the existing filter.
• Match those numbers exactly to the replacement’s dimensions.

2. Evaluate Filtration Efficiency and Media

HEPA filters differ in particle capture rates. The AS‑HF model removes oily aerosols down to 0.3 microns with an efficiency of up to 99.97 %. This level is ideal for allergy sufferers and homes with pets.

A pre‑filter (AS‑PF pleated media) sits in front of the HEPA media. Replacing the pre‑filter regularly extends the life of the expensive HEPA element and keeps airflow strong.

• Choose a filter rated ≥99.97 % for true HEPA performance.
• Plan to swap the pre‑filter every 3‑4 months.

3. Timing Your Replacements

Air quality, usage frequency, and household size affect filter lifespan. In a typical home, the B‑Air AS‑HF filter lasts about 6‑12 months before pressure drop reduces fan efficiency.

Set a reminder on your phone or use the purifier’s timer function to check the filter status monthly.

• Replace HEPA filter at least once a year.
• Inspect the pre‑filter quarterly.

Decision Rules for Selecting Your HEPA Filter

• Check Model Compatibility: Verify the exact filter dimensions listed in your purifier’s manual match the B‑Air AS‑HF specifications. If dimensions differ, seek a Lasko‑branded replacement or contact support.
• Match Filtration Efficiency: Choose a filter with ≥99.97 % HEPA rating to ensure capture of 0.3 micron particles. Higher efficiency may cost more but delivers better health benefits.
• Plan for Pre‑Filter Maintenance: Replace the AS‑PF pre‑filter regularly to protect the HEPA media and maintain airflow. A clean pre‑filter extends the life of the expensive HEPA element.

Product Facts to Consider

• B-Air AS-HF Stage 2 Air Scrubber HEPA Filters: 2 pack: The AS-HF HEPA filter is properly secured inside the cabinet of an air scrubber to filter oily aerosols down to 0.3 microns with an efficiency rating of up to 99.97%. High efficiency removes fine particulates that cause allergies, while the secure fit prevents air bypass that would reduce purifier performance.
• Lasko 32" Tower Fan: Oscillating, 3-Speed, Remote, Timer, Ionizer, Black: The Lasko 32-Inch Oscillating Tower Fan with Ionizer combines a built-in ionizer for fresher-feeling indoor air with 3 quiet speeds and widespread oscillation for customizable, whole-room comfort. Understanding that Lasko also offers ionizing fans helps you coordinate airflow and filtration strategies across rooms, especially when a purifier is paired with a fan for better distribution.

Who This Filter Is Best For

Best For

• Households with allergy or asthma sufferers
• Homes with pets that shed dander

Not Ideal For

• Users of Lasko models that require a proprietary filter size not matching AS‑HF dimensions
• Environments where a simple carbon filter suffices (e.g., low‑dust offices)

Choosing the right HEPA filter keeps your Lasko tower purifier operating at peak efficiency and protects your family’s health. Follow the size, efficiency, and maintenance rules outlined here, and you’ll enjoy cleaner air year after year.