Demiwise 18x18x1 Washable Aluminum HVAC Air Filter

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Product guide

Demiwise 18x18x1 Washable Aluminum HVAC Air Filter

Demiwise 18x18x1 is a washable, reusable aluminum panel filter for compatible residential air conditioners, furnaces, and HVAC systems. It is listed as MERV 8, with a stated actual size smaller than its nominal dimensions, so fit and filtration claims deserve particular attention before purchase.

At a glance

Washable and reusable design is intended to replace routine disposal of conventional filters.
The listing describes electrostatic filtration for lint, dust, and pet dander.
The manufacturer recommends cleaning every 1–3 months, while another listing claim says every 3 months.
Slides into a compatible filter slot, according to the listing.

Price

$49.99Save 17%

Reference price: ~~$60.58~~

Price checked: Nov 14, 2026

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Often bought together

Demiwise MERV 13 Air Filter Material -23 Ft² Cut to Fit Air Filter Media for Home HVAC, Furnace, AC & Purifier -Filters Dust

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Demiwise MERV 8 Air Vent Filters Kit 20x100 Inch|Cut to Fit (100+ Filters) Filter Material,High-Grade Electrostatic Filter Me

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Pros and cons

Pros

Reusable construction may reduce repeated replacement purchases for buyers willing to clean and dry the filter.
The aluminum panel is described as washable, with a manufacturer-recommended periodic cleaning routine.
A nominal 18x18x1 listing and stated actual dimensions help identify the intended filter slot size.

Cons

Cleaning and fully air-drying are ongoing maintenance tasks, unlike replacing a disposable filter.
Customer feedback reports mixed dust-capture effectiveness, so this is not a strong choice when dependable fine-particle filtration is the priority.

Technical specifications

13 specifications

Identity
Brand	Demiwise
Model	18x18x1(Actual Size:17.50x17.50x0.82)

Dimensions and installation
Dimensions listed	18"L x 18"W x 1"Th
Mounting type	Slide In
Shape	Rectangular
Construction	Panel

Filtration and compatibility
MERV rating listed	8
Compatible devices	Air Conditioner, Furnace, HVAC
Compatible HVAC systems	residential
Common applications	Residential, Appliances, Schools/Office Buildings

Materials and protection
Material listed	(Actual Size:17.50x17.50x0.82), Aluminum

Quantity and support
Number of items	1
Warranty description	5 year manufacturer

What to know before buying

Listing details to confirm

Listing details are inconsistent: the title/model states an actual size of 17.50x17.50x0.82, while listed product dimensions say 18"L x 18"W x 1"Th. The MERV 8 claim is also qualified by manufacturer Q&A that calls it equivalent to MERV 8 rather than MERV-rated, and cleaning guidance varies between every 1–3 months and every 3 months. Check the slot dimensions and filtration requirements for your system before buying.

What’s in the box

Included

1 aluminum AC/HVAC furnace filter

Who is it for?

A good fit for

Owners of compatible residential AC, furnace, or HVAC systems who prefer a washable filter and are prepared to clean and dry it periodically.
Buyers whose filter slot matches the stated actual dimensions and who are comfortable with the manufacturer's qualified MERV 8-equivalent claim.

Less suited to

Anyone who needs verified MERV certification or has a system requiring a specific filtration rating without ambiguity.
Buyers who need precise fit assurance without checking the difference between nominal and actual dimensions.
People seeking a maintenance-free replacement or relying on consistent fine-dust capture.

Demiwise 18x18x1 Washable Aluminum HVAC Air Filter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 1,125 ratings

5 stars73%73%
4 stars11%11%
3 stars4%4%
2 stars3%3%
1 star9%9%

Customer feedback highlights perceived build quality, ease of cleaning, and reduced need to buy replacement filters, with some buyers also considering it worth the cost. Reports are mixed on size, dust filtration, and suitability for HVAC systems. This matters because the listed actual dimensions are smaller than the nominal size, and the MERV 8 designation is qualified by the manufacturer. The aggregate ratings lean positive overall, but they do not resolve those fit and performance concerns.

Positive themes

Customers describe the filter as well-built and easy to clean.
Some customers appreciate being able to reuse it instead of buying filters monthly.

Mixed feedback

Customer feedback is mixed on whether the size matches expectations.
Customers report differing experiences with dust getting through.
Suitability for HVAC systems receives mixed feedback.

Frequently asked questions

What are the listed dimensions?

The product is listed as 18"L x 18"W x 1"Th, but the title and model state an actual size of 17.50x17.50x0.82. Measure the filter slot and confirm which dimensions apply to your system.

Is the filter officially MERV 8 rated?

The details list MERV Rating 8, while manufacturer Q&A says electrostatic filters are not MERV rated and describes this filter as equivalent to MERV 8. Treat the rating as a qualified manufacturer claim.

How often should it be cleaned?

The listing gives differing guidance: every 1–3 months in its description and every 3 months in a feature. The manufacturer says to air-dry it before reinstalling.

What does the manufacturer say it captures?

The listing claims electrostatic capture of lint, dust, and pet dander. Customer feedback is mixed about dust filtration, so results should not be assumed.