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DIY Box Fan Air Purifier Components

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DIY Box Fan Air Purifier Components

#appliances#home-improvement#tools#materials#hardware
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This bundle provides the essential components for constructing a DIY box fan air purifier. It is designed for individuals seeking an affordable and effective solution for improving indoor air quality. The products collectively enable the assembly of a personal air filtration system, often referred to as a Corsi-Rosenthal box.

Curated by Kitchen Bench · Updated June 2026

Built for home cooks dealing with heavy smoke and searing odors who need a high-volume filtration fix that won't clutter limited counter space. Not for those seeking a silent HEPA unit for a bedroom — this shop focuses on rugged, high-airflow components that handle kitchen-grade grease and smoke particles.

Curator's pick: MERV 13 Pleated Air Filter 20x20x1

This is the sweet spot for kitchen use because it catches the fine particulates from frying without choking the fan's motor; anything lower like a MERV 8 won't touch the smell, and anything higher usually restricts airflow too much for a standard box fan.

⚠ Worth knowing: These DIY setups are loud and bulky, meaning you won't want it running while hosting a dinner party. Also, if you don't use a cardboard shroud on the front of the fan, you lose about 20% of the air movement through the corners of the blades, making the whole rig much less efficient.

Commercial Grade Degreasers for Industrial Kitchen SurfacesDigital Thermo-Hygrometers for Monitoring Kitchen Air QualityReplacement Carbon Pre-Filters for Heavy Odor Absorption

This shop is built from the principles of the Corsi-Rosenthal box, a highly effective and affordable DIY air purifier design. It brings together common household items and readily available filters to create a system that significantly improves indoor air quality.

This setup is ideal for anyone concerned about airborne particles, allergens, or viruses in their home, office, or classroom. It's perfect for students, renters, or those on a budget who want to take control of their air quality without investing in expensive commercial units.

To get started, focus on the fan and a single filter. The full build, including structural components and multiple filters, typically ranges from $100 to $170 for a complete and robust air filtration system.

Full build

$98–$170

Starter

$65–$125

Fan + 2 Filters + Tape

Best forDIY EnthusiastsAllergy SufferersBudget ConsciousRentersClassroomsPet Owners
20 Inch 3 Speed Box Fan

20 Inch 3 Speed Box Fan

98%

Lasko

ASIN:
B081QRTK1F
Appliances$25 - $40

This is a standard 20-inch box fan with three speed settings. It serves as the primary air movement device for a DIY air purifier, drawing air through filters. It is suitable for anyone looking to build a basic and effective air cleaner.

  • 20-inch blade diameter
  • 3 fan speeds
  • Portable, lightweight design
  • Standard household appliance
  • Plastic housing, metal grille

In this shop: This fan is a core component, aligning with the DIY Box Fan Air Purifier Components vibe by providing the necessary air circulation unit.

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MERV 13 Pleated Air Filter 20x20x1

MERV 13 Pleated Air Filter 20x20x1

95%

FilterBuy

ASIN:
B07YYKNY4N
Home Improvement$40 - $60

This is a MERV 13 pleated air filter, measuring 20x20x1 inches. It is designed to capture fine particles, including smoke, pollen, and viruses, when integrated into a DIY air purifier. This filter is ideal for those prioritizing high-efficiency particulate removal.

  • MERV 13 filtration efficiency
  • 20x20x1 inch dimensions
  • Pleated synthetic media
  • Captures fine particulates
  • Disposable air filter

In this shop: This high-efficiency filter is central to the DIY Box Fan Air Purifier Components vibe, providing key filtration capability for a homemade unit.

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Multi-Surface Heavy Duty Duct Tape

Multi-Surface Heavy Duty Duct Tape

92%

Nashua

ASIN:
B00B1FT6CQ
Tools$8 - $15

This is a heavy-duty, multi-surface duct tape roll. It is used to create airtight seals between air filters and the box fan or between multiple filters in a DIY air purifier. This tape ensures that air passes through the filters efficiently.

  • Strong adhesive bond
  • Multi-surface compatibility
  • Water-resistant properties
  • Durable fabric-reinforced backing
  • Standard roll size

In this shop: This duct tape fits the DIY Box Fan Air Purifier Components vibe by offering a practical and essential material for assembly and sealing.

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Corsi-Rosenthal Box Cardboard Shroud

Corsi-Rosenthal Box Cardboard Shroud

85%

Generic

ASIN:
B007Y9DD3G
Materials$5 - $10

This is a cardboard shroud specifically designed for Corsi-Rosenthal box air purifiers. It provides a structural element to contain filters or create a top/bottom seal in a multi-filter configuration. It is for DIY enthusiasts seeking a simple, inexpensive structural aid.

  • Corrugated cardboard material
  • Pre-cut shape for CR box
  • Lightweight and disposable
  • Aids in filter alignment
  • Simple to assemble

In this shop: This cardboard shroud integrates well with the DIY Box Fan Air Purifier Components vibe by offering an inexpensive structural element for homemade purifiers.

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FPR 10 Rated Pleated AC Furnace Filter

FPR 10 Rated Pleated AC Furnace Filter

90%

Honeywell

ASIN:
B085VC1MDX
Home Improvement$15 - $25

This is an FPR 10 rated pleated AC furnace filter. It offers high fine-particle filtration, serving as an alternative to MERV 13 filters for those preferring the FPR rating system. It is suitable for similar applications in a DIY air purifier setup.

  • FPR 10 filtration rating
  • Pleated synthetic filter media
  • Captures fine dust and allergens
  • Standard furnace filter size
  • Disposable replacement filter

In this shop: This FPR 10 filter aligns with the DIY Box Fan Air Purifier Components vibe, offering an alternative high-efficiency filtration option for homemade units.

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Box Fan Air Filter Bracket Set

Box Fan Air Filter Bracket Set

80%

Generic

ASIN:
B0CRR4ZDYK
Hardware$10 - $20

This is a set of brackets designed to secure air filters to the back of a standard box fan. It provides a more robust and reusable attachment method than tape for DIY air purifiers. This set is for users who prefer a cleaner, more stable filter mounting solution.

  • Plastic or metal construction
  • Designed for standard box fans
  • Secures multiple filters
  • Reusable mounting solution
  • Tool-less installation

In this shop: This bracket set complements the DIY Box Fan Air Purifier Components vibe by providing a structured alternative for attaching filters to the fan.

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What works

  • This combination of products offers a highly effective air purification solution that significantly reduces airborne particles, allergens, and odors in any room.
  • Building your own air purifier with these components is significantly more affordable than purchasing pre-built commercial units with comparable filtration capabilities.
  • The modular design allows for easy maintenance, filter replacement, and the option to upgrade components as needed without replacing the entire system.

What to know

  • The assembled unit may be bulkier and less aesthetically pleasing than commercial air purifiers, which might be a consideration for some room designs.
  • While assembly is straightforward, it does require some manual effort and basic DIY skills to ensure proper sealing and optimal performance.

How to use this together

  1. 1

    Attach the Filters to the Fan

    Begin by orienting your 20 Inch 3 Speed Box Fan. Use the Box Fan Air Filter Bracket Set to securely attach one MERV 13 Pleated Air Filter 20x20x1 to the intake side of the fan. This ensures a stable and reusable connection for primary filtration.

  2. 2

    Construct the Filter Cube

    Take three additional MERV 13 Pleated Air Filters and arrange them to form a cube around the fan's sides, leaving one side open for the fan's exhaust. Use the Multi-Surface Heavy Duty Duct Tape to seal all edges where the filters meet, creating an airtight enclosure.

  3. 3

    Secure and Seal the Structure

    Place the Corsi-Rosenthal Box Cardboard Shroud over the top and bottom of your filter cube, taping it securely with the Multi-Surface Heavy Duty Duct Tape. This adds structural rigidity and ensures that all air is drawn through the filters effectively, preventing air bypass.

Frequently asked questions