---
product_id: 312123344
title: "AC Infinity Inline Filter Box 4\" with High Efficacy Filter, Whole House HVAC Filtration Kit, Fits 4-Inch Inline Duct Fans for Fresh Air Intake and Ventilation"
brand: "ac infinity"
price: "2056 zł"
currency: PLN
in_stock: true
reviews_count: 8
category: "Ac Infinity"
url: https://www.desertcart.pl/products/312123344-ac-infinity-inline-filter-box-4-with-high-efficacy-filter
store_origin: PL
region: Poland
---

# MERV 13 high efficacy filter included 400 CFM max airflow capacity 1mm thick cold-rolled steel build AC Infinity Inline Filter Box 4" with High Efficacy Filter, Whole House HVAC Filtration Kit, Fits 4-Inch Inline Duct Fans for Fresh Air Intake and Ventilation

**Brand:** ac infinity
**Price:** 2056 zł
**Availability:** ✅ In Stock

## Summary

> 🌟 Elevate your air game — filter smarter, breathe fresher!

## Quick Answers

- **What is this?** AC Infinity Inline Filter Box 4" with High Efficacy Filter, Whole House HVAC Filtration Kit, Fits 4-Inch Inline Duct Fans for Fresh Air Intake and Ventilation by ac infinity
- **How much does it cost?** 2056 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/312123344-ac-infinity-inline-filter-box-4-with-high-efficacy-filter)

## Best For

- ac infinity enthusiasts

## Why This Product

- Trusted ac infinity brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Filter Swaps:** Slide-lock door with neoprene seal ensures quick, dust-free access to replace filters without hassle.
- • **Rugged Weatherproof Armor:** Built with durable cold-rolled steel and aluminum flanges to withstand extreme conditions and last for years.
- • **Seamless HVAC Integration:** Designed to fit 4-inch inline fans like the CLOUDLINE series for optimized fresh air intake and ventilation.
- • **Maximize Space & Efficiency:** Compact 23.46” x 8.42” x 11.73” footprint frees up room while delivering up to 400 CFM airflow.
- • **Breathe Cleaner, Live Better:** High-efficacy MERV 13 filter traps dust, dirt, lint, and odors down to 0.3 microns for fresher indoor air quality.

## Overview

The AC Infinity Inline Filter Box 4" is a robust whole-house HVAC filtration solution featuring a 1mm thick cold-rolled steel body with aluminum flanges, designed to fit 4-inch inline duct fans. It includes a high-efficacy MERV 13 filter that captures particles as small as 0.3 microns, ensuring cleaner air intake. With a maximum airflow of 400 CFM and a user-friendly slide-lock door with neoprene sealing, this filter box offers durable, easy-to-maintain, and efficient air filtration for improved indoor air quality and ventilation.

## Description

Product description Product Description A whole-house air filtration system designed for use with inline duct fans such as the CLOUDLINE Series, to circulate fresh air by blocking particles like dust and dirt from entering your home in intake applications. Each air filter box is built using 1mm thick cold-rolled steel and finished with matte black powder coating. This outer body build comes together with aluminum duct flanges to create a sturdy build capable of withstanding inclement weather. Its low-maintenance design features a hinge-sealed door equipped with a slide lock that provides easy access to the inner chamber. The door is lined with a soft neoprene layer that keeps the filter in place and dust from seeping inside. Applications Each air filter box accepts standard MERV filter replacements that slide into the inner chamber’s filter slot. Comes included with a high-efficacy pleated air filter, capable of trapping 0.3-1.0 micron-sized particles such as Dust Dirt Lint Odor The duct flanges fit with matching-sized inline fans and enable a streamlined installation to create high-efficiency filtration in HVAC and grow applications. Attaching the air filter box to the starting end of your ductwork will dramatically reduce suspending particles in the air inside your home. Use with a high static pressure fan like the CLOUDLINE Series of duct fans is highly recommended to ensure maximum filtration. HVAC Filter Box Intake air filtration system designed to circulate fresh air and block particles from entering indoor settings. Home Inline Air Filtration When used with a high static pressure duct fan, filter boxes can not only purify the air with maximum efficiency but also provide light cooling to improve comfort. Place this filter box at the beginning of your ductwork to keep dust, dirt, lint, and odors out, reducing suspending particles inside your home. Sturdy and Weather-Resistant Made of 1mm thick cold-rolled steel and aluminum duct flanges with a matte black powder coating finish encasing the interior filter, held in place by neoprene padding. Easy Access Design Slide lock hatch system provides quick access to the inner chamber's filter slot for direct and speedy replacement, accepting standard-sized MERV filters. High Efficacy Protection

Review: Great box, worth the money! - Great filter box. Built with good materials. Hinges are smooth and the latch is solid and looks and works great. I used this for my fresh air intake with a motorized damper for my A/C system. The inlet and outlet flanges were true to size and the door sealed very well with no leakage. It was easy to install and remove the included filter. This is heavy gauge metal and makes the box have some weight to it, so be prepared to have a way to mount or hang it. It's easy to tell this is a good product. The shipping box and packing were really nice....I hated to throw it away. You get quality with this box, it's worth the money, which is hard to find these days.
Review: Allows more room inside your tent. - Great product. It allows me to move all my ventilation outside the tent, I use it as my pre filter and have the fan mounted directly to the carbon filter, giving far more room inside.

## Features

- A duct filter box designed for use with inline fans to circulate fresh air and block dust and odors.
- Built with 1mm thick cold-rolled steel and aluminum duct flanges, able to withstand extreme weather.
- Slide lock door gives easy access to inner chamber while soft neoprene layer creates dust-free seal.
- Includes a standard high efficacy filter that traps particles like dust, dirt, lint, and odor.
- 23.46 x 8.42 x 11.73” | Fits 4” Inline Fans | 400 CFM Maximum | Accepts 12 x 20 x 1” Filters

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0921N33Y7 |
| Best Sellers Rank | #31,765 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #245 in Furnace Filters |
| Brand | AC Infinity |
| Brand Name | AC Infinity |
| Compatible Devices | CLOUDLINE S4, CLOUDLINE T4 |
| Customer Reviews | 4.6 out of 5 stars 320 Reviews |
| Item Dimensions L x W x Thickness | 23.46"L x 8.42"W x 11.73"Th |
| Item Weight | 6.42 Kilograms |
| MERV Rating | 13 |
| Manufacturer | AC Infinity |
| Material | Alloy Steel |
| Material Type | Alloy Steel |
| Model Number | AC-AFB4 |
| Number of Items | 1 |
| Product Dimensions | 23.46"L x 8.42"W x 11.73"Th |
| Product Grade | new |
| UPC | 819137021693 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** AC Infinity
- **Compatible Devices:** CLOUDLINE S4, CLOUDLINE T4
- **Item Weight:** 6.42 Kilograms
- **MERV Rating:** 13
- **Manufacturer:** AC Infinity
- **Material:** Alloy Steel
- **Number of Items:** 1
- **Product Dimensions:** 23.46"L x 8.42"W x 11.73"Th
- **Product Grade:** new
- **UPC:** 819137021693

## Images

![AC Infinity Inline Filter Box 4" with High Efficacy Filter, Whole House HVAC Filtration Kit, Fits 4-Inch Inline Duct Fans for Fresh Air Intake and Ventilation - Image 1](https://m.media-amazon.com/images/I/41EWnjz-1aS.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: what filter fits perfect in the 4" filter box?**
A: the 4" and 6" filters take 12x20x1" filters; the 8 and 10" box's take 14x20x1" filters

**Q: What filter replacement is suggested for the 6" filter box?  standard 20x12x1 does not fit.**
A: Different brands of filters have different "actual" sizes.  Look up the true size of the filter you are using, then check actual filter sizes for different brands that are smaller.

**Q: Do the filters trap smoke from pipes or pollen and mildew?**
A: No, you need a carbon filter for smoke

**Q: Can I use a MERV 17 or HEPA filter instead of a MEV13 filter for additional filtration if they will even fit?**
A: I use the HDX FPR 12 Ultimate Allergen with odor reduction. This filter is a higher end filter.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great box, worth the money!
*by T***D on October 8, 2025*

Great filter box. Built with good materials. Hinges are smooth and the latch is solid and looks and works great. I used this for my fresh air intake with a motorized damper for my A/C system. The inlet and outlet flanges were true to size and the door sealed very well with no leakage. It was easy to install and remove the included filter. This is heavy gauge metal and makes the box have some weight to it, so be prepared to have a way to mount or hang it. It's easy to tell this is a good product. The shipping box and packing were really nice....I hated to throw it away. You get quality with this box, it's worth the money, which is hard to find these days.

### ⭐⭐⭐⭐⭐ Allows more room inside your tent.
*by M***H on February 14, 2026*

Great product. It allows me to move all my ventilation outside the tent, I use it as my pre filter and have the fan mounted directly to the carbon filter, giving far more room inside.

### ⭐⭐⭐⭐⭐ I found a replacement filter for the 6" model
*by N***M on December 30, 2022*

We used this 6" model for a fresh make up air for our house. Reading the review we realized people were upset that AC Infinity doesn't sell replacement air filters and those readily available filters at the big box store won't fit. If you are searching for a replacement then buy the Nordic Pure 12x20x1. Amazon sells this brand of filter as well. The actual measurements for this filter is: 11.5 x 19.5 x 0.75 inches. Although this air filter is about 0.25-.05 in short on the length and width, it still fit the air box and the seal is still in tact. See pictures for a visual illustration and reference my finger. As for the air box itself, this is a well constructed and high quality air inbox. This is expensive but I believe the quality and craftsmanship justified the price. I hope this review helps.

## Frequently Bought Together

- AC Infinity Inline Filter Box 4" with High Efficacy Filter, Whole House HVAC Filtration Kit, Fits 4-Inch Inline Duct Fans for Fresh Air Intake and Ventilation
- AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
- AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-03-14*