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Filtrete 18x18x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81 x 17.81 x 0.81 in)

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filtrete 18x18x1 ac furnace air filter merv 11 mpr 1000 micro allergen defense 3-month pleated 1-inch electrostatic air cleaning filter 4 pack actual size 1781 x 1781 x 081 in

$ 44.95

Last price was updated on: 12th Dec 2025, 07:08 PM

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Pricing Analytics & Buying Assistance

Price Score: Excellent!

Poor Average Good Excellent

Current Price $44.95

$4.10

Lowest

$89.99

Highest

Buying Advice:
Excellent! Buy now. 45% chance price goes up. Buy soon.

Price History Benchmarks

Lowest Ever

$4.10

27th Sep 2017

Highest Ever

$89.99

10th Nov 2020

Average Price

$47.60

672 data points

Last 3M Low

$43.57

8th Oct 2025

Last 6M Low

$40.37

11th Jul 2025

Last 12M Low

$27.81

28th Dec 2024

Price History Chart

Product Variants

Image of Filtrete 16x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.69 x 24.69 x 0.81 in)

Filtrete 16x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.69 x 24.69 x 0.81 in)

Image of Filtrete 16x20x2 AC Furnace Air Filter, MERV 11, MPR 1000, Allergen Defense, 3-Month Pleated 2-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.5 x 19.5 x 1.75 in)

Filtrete 16x20x2 AC Furnace Air Filter, MERV 11, MPR 1000, Allergen Defense, 3-Month Pleated 2-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.5 x 19.5 x 1.75 in)

Image of Filtrete 16x21x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack

Filtrete 16x21x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack

Image of Filtrete 16x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.69 x 19.69 x 0.81 in)

Filtrete 16x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.69 x 19.69 x 0.81 in)

Image of Filtrete 18x18x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81 x 17.81 x 0.81 in)

Filtrete 18x18x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81 x 17.81 x 0.81 in)

Image of Filtrete 12x12x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.81x11.81x0.81 in)

Filtrete 12x12x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.81x11.81x0.81 in)

Image of Filtrete 12x36x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.69 x 35.69 x 0.81 in)

Filtrete 12x36x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.69 x 35.69 x 0.81 in)

Image of Filtrete 16x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 23.813x15.813x0.656 in)

Filtrete 16x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 23.813x15.813x0.656 in)

Image of Filtrete 25x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 24.688x24.688x0.813 in)

Filtrete 25x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 24.688x24.688x0.813 in)

Image of Filtrete 14x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81 x 24.81 x 0.81 in)

Filtrete 14x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81 x 24.81 x 0.81 in)

Image of Filtrete 14x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81 x 23.81 x 0.81 in)

Filtrete 14x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81 x 23.81 x 0.81 in)

Image of Filtrete 14x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81x19.81x0.81 in)

Filtrete 14x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81x19.81x0.81 in)

Image of Filtrete 18x30x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81 x 29.81 x 0.81 in)

Filtrete 18x30x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81 x 29.81 x 0.81 in)

Image of Filtrete 24x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 23.69x23.69x0.81 in)

Filtrete 24x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 23.69x23.69x0.81 in)

Image of Filtrete 16x25x2 AC Furnace Air Filter, MERV 11, MPR 1000, Allergen Defense, 3-Month Pleated 2-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.5 x 24.5 x 1.75 in)

Filtrete 16x25x2 AC Furnace Air Filter, MERV 11, MPR 1000, Allergen Defense, 3-Month Pleated 2-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.5 x 24.5 x 1.75 in)

Image of Filtrete 12x30x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.81 x 29.81 x 0.81 in)

Filtrete 12x30x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.81 x 29.81 x 0.81 in)

Image of Filtrete 10x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 9.81x19.81x0.81 in)

Filtrete 10x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 9.81x19.81x0.81 in)

Image of Filtrete 16x30x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 29.813x15.813x0.656 in)

Filtrete 16x30x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 4-Pack 29.813x15.813x0.656 in)

Image of Filtrete 20x22x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.81 x 21.81 x 0.81 in)

Filtrete 20x22x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.81 x 21.81 x 0.81 in)

Image of Filtrete 20x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.69 x 19.69 x 0.81 in)

Filtrete 20x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.69 x 19.69 x 0.81 in)

Image of Filtrete 12x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.69 x 23.69 x 0.81 in)

Filtrete 12x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.69 x 23.69 x 0.81 in)

Image of Filtrete 20x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.69 x 24.69 x 0.81 in)

Filtrete 20x25x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.69 x 24.69 x 0.81 in)

Image of Filtrete 20x25x2 AC Furnace Air Filter, MERV 11, MPR 1000, Allergen Defense, 3-Month Pleated 2-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.5 x 24.5 x 1.75 in)

Filtrete 20x25x2 AC Furnace Air Filter, MERV 11, MPR 1000, Allergen Defense, 3-Month Pleated 2-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.5 x 24.5 x 1.75 in)

Image of Filtrete 20x23x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack

Filtrete 20x23x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack

Image of Filtrete 20x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.81x23.81x0.81 in)

Filtrete 20x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 19.81x23.81x0.81 in)

Image of Filtrete 14x18x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81 x 17.81 x 0.81 in)

Filtrete 14x18x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 13.81 x 17.81 x 0.81 in)

Image of Filtrete 17.5x23.5x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.19x23.19x0.81 in)

Filtrete 17.5x23.5x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.19x23.19x0.81 in)

Image of Filtrete 12x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.81x19.81x0.81 in)

Filtrete 12x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 11.81x19.81x0.81 in)

Image of Filtrete 16x16x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.81 x 15.81 x 0.81 in)

Filtrete 16x16x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 15.81 x 15.81 x 0.81 in)

Image of Filtrete 18x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81 x 19.81 x 0.81 in)

Filtrete 18x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81 x 19.81 x 0.81 in)

Image of Filtrete 15x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 14.81x19.81x0.81 in)

Filtrete 15x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 14.81x19.81x0.81 in)

Image of Filtrete 18x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81x23.81x0.81 in)

Filtrete 18x24x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4 Pack (Actual Size 17.81x23.81x0.81 in)

Product Technical Information

Product Code	B005GZ8PEC
Market Place	amazon.com
Market Place Name	Amazon.com
Brand Name	Filtrete
Rating	4.8 ( 23873 ratings )
Category	Furnace Filters
Manufacturer	3M
Model Number	9817-4
Item Color	18x18x1
Item Size	18x18x1
Item Dimensions	17.81 x 0.81 x 17.81 inches

Frequently Asked Questions

What is the lowest price ever for this product? ▶

The lowest price for Filtrete 18x18x1 AC Furnace Air Filter MERV 11 MPR 1000 Micro Allergen Defense 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4 Pack Actual Size 1781 x 1781 x 081 in was $4.10 on 27th Sep 2017. This is the best recorded deal so far.
What is the highest price ever for this product? ▶

The highest price for Filtrete 18x18x1 AC Furnace Air Filter MERV 11 MPR 1000 Micro Allergen Defense 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4 Pack Actual Size 1781 x 1781 x 081 in was $89.99 on 10th Nov 2020. Prices have dropped since then.
What is the average price of this product? ▶

The average price for Filtrete 18x18x1 AC Furnace Air Filter MERV 11 MPR 1000 Micro Allergen Defense 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4 Pack Actual Size 1781 x 1781 x 081 in is $47.60 (672 data points). This helps you compare current deals.
What is the lowest price in the last 3 months? ▶

In the last 3 months, Filtrete 18x18x1 AC Furnace Air Filter MERV 11 MPR 1000 Micro Allergen Defense 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4 Pack Actual Size 1781 x 1781 x 081 in reached a low of $43.57 on 8th Oct 2025. Recent price trends may help you decide when to buy.
Should I buy this product now? ▶

Buy now. The price is excellent compared to its history. 45% chance price goes up. Price may increase soon.