---
product_id: 733392801
title: "AC Infinity 4\" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4\" Inline Duct Fans for Fresh Air Intake and Ventilation"
brand: "ac infinity"
price: "Rp3896689"
currency: IDR
in_stock: false
url: https://www.desertcart.id/products/733392801-ac-infinity-4-inline-filter-box-with-high-efficiency-filter
store_origin: ID
region: Indonesia
---

# 1mm cold-rolled steel & aluminum build Supports up to 400 CFM airflow MERV 13 high-efficiency filter AC Infinity 4" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4" Inline Duct Fans for Fresh Air Intake and Ventilation

**Brand:** ac infinity
**Price:** Rp3896689
**Availability:** ❌ Out of Stock

## Summary

> 🌿 Breathe smarter, live better — upgrade your air game now!

## Quick Answers

- **What is this?** AC Infinity 4" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4" Inline Duct Fans for Fresh Air Intake and Ventilation by ac infinity
- **How much does it cost?** Rp3896689 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.id](https://www.desertcart.id/products/733392801-ac-infinity-4-inline-filter-box-with-high-efficiency-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

- • **Advanced Air Purification:** MERV 13 filter traps viruses, pollen, dust & mold for cleaner, healthier air.
- • **Seamless Maintenance Access:** Sliding lock door with neoprene seal offers quick, dust-free filter changes without hassle.
- • **Whole-House Fresh Air Solution:** Integrates easily with HVAC systems to elevate your indoor air quality and comfort.
- • **Optimized Airflow Compatibility:** Perfectly fits 4" inline duct fans and supports up to 400 CFM for efficient ventilation.
- • **Durable Weather-Resistant Design:** Robust 1mm cold-rolled steel and aluminum flanges ensure long-lasting performance in any climate.

## Overview

The AC Infinity 4" Inline Filter Box is a premium HVAC accessory designed to fit 4" inline duct fans, supporting up to 400 CFM airflow. Constructed from durable 1mm cold-rolled steel and aluminum, it features a high-efficiency MERV 13 filter that captures viruses, dust, pollen, and mold spores. Its sliding lock door with a neoprene seal ensures easy, dust-free maintenance, making it an essential upgrade for whole-house fresh air intake and superior ventilation.

## Description

Duct filter box designed for inline fans to circulate fresh air and block out dust and odors. Made from 1mm thick cold rolled steel and aluminum duct flange to withstand extreme weather conditions. The sliding lock door provides easy access to the inner chamber while the soft neoprene layer creates a dust-free seal. Includes standard high efficiency filter to capture particles such as dust, dirt, lint, and odors. 23.5" x 8.4" x 11.75" | Fits 4" inline fans | Fits up to 400CFM | Fits 12" x 20" x 1" filters Product Description Whole house air filtration system designed for use with inline duct fans such as CLOUDLINE series such as air by blocking particles. Dust and dirt entering your home with air intake applications. Each air filter box is made from 1mm thick cold rolled steel and finished with a matte black powder coating. This outer bodybuilding is paired with aluminum duct flanges to make it tough enough to withstand the elements. Designed to be low maintenance, it features a hinged door with sliding lock for easy access to the inner chamber. The door is lined with a soft neoprene layer to keep the filter in place and prevent dust from seeping inside. Applications: Each air filter box fits standard MERV filter replacements that slide into the filter slot in the inner chamber. Includes a highly efficient pleated air filter that captures particles between 0.3 to 1.0 microns: dust, dirt, lint odors, and duct flanges fit a matching size 4" inline fan for streamlined installation and HVAC for high efficiency filtration and growing applications. Installing the air filter box at the beginning of the duct will greatly reduce the airborne particles in your home. To ensure maximum filtration, it is highly recommended to use with high static pressure fans like CLOUDLINE series duct fans. Product identification manufacturer AC Infinity Inc. Product Name Air Filter Box 4" Product Model AC-AFB4 UPC Code 819137021693 Product and Installation Dimensions Duct Opening Size 3.85" (3.8 inches) Total dimensions 23.5 x 8.5 x 11.75 inches (23.5" x 8.4" x 11.75") Flange size 3.25" (3.25") PRODUCT PERFORMANCE & TECHNICAL SPECIFICATIONS Box Material Steel Flange Material Aluminum Finish Matte Black Filter Size 12 x 20 x 1 Min Air Range 80-120 CFM Max Wind 400 CFM Compatible Fan Model CLOUDLINE S4, CLOUDLINE T4 Product Manual Product Manual PDF

## Features

- Duct filter box is used with series fans to circulate fresh air and block contaminants
- Made of 1mm thick cold-rolled steel and aluminum duct flanges to withstand extreme weather
- Sliding lock door provides easy access to the inner chamber and a soft neoprene layer keeps dust out
- Includes standard MERV 13 filter to capture particles such as viruses, dust, pollen, mold spores, and more
- 23.5" x 8.4" x 11.7" | Fits 4" Inline Fan | Fits up to 400 CFM | Fits 12" x 20" x 1" Filters

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand Name | AC Infinity |
| Select | AC-AFB4 |
| Part Number | AC-AFB |
| Compatible Device | CLOUDLINE S4, CLOUDLINE T4 |
| Material | Alloy Steel Aluminum |
| Batteries Included | No |
| Batteries Required? | No |
| Item Dimensions  L x W x H | 23 x 12 x 8 mm |
| Item Weight | 6.42 Kilograms |

## Product Details

- **Brand:** AC Infinity
- **Material:** Alloy Steel Aluminum
- **Product Dimensions:** 59.7L x 21.3W x 0.1Th cm
- **MERV Rating:** 13
- **Compatible Devices:** CLOUDLINE S4, CLOUDLINE T4
- **Item Weight:** 6.42 Kilograms
- **UPC:** 819137021693
- **Number of Items:** 1
- **Manufacturer:** AC Infinity
- **Product Grade:** Brand New

## Images

![AC Infinity 4" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4" Inline Duct Fans for Fresh Air Intake and Ventilation - Image 1](https://m.media-amazon.com/images/I/41EWnjz-1aS.jpg)
![AC Infinity 4" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4" Inline Duct Fans for Fresh Air Intake and Ventilation - Image 2](https://m.media-amazon.com/images/I/51keHQnx4lL.jpg)
![AC Infinity 4" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4" Inline Duct Fans for Fresh Air Intake and Ventilation - Image 3](https://m.media-amazon.com/images/I/51NyArbfr0S.jpg)
![AC Infinity 4" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4" Inline Duct Fans for Fresh Air Intake and Ventilation - Image 4](https://m.media-amazon.com/images/I/61yP1T29OcL.jpg)
![AC Infinity 4" Inline Filter Box with High Efficiency Filter, Whole House HVAC Filter Kit, Fits 4" Inline Duct Fans for Fresh Air Intake and Ventilation - Image 5](https://m.media-amazon.com/images/I/61ubRjGZ8mL.jpg)

## 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.

## 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 Indonesia*
*Store origin: ID*
*Last updated: 2026-02-25*