---
product_id: 375478334
title: "AC Infinity Inline Filter Box with Merv 13 Filter, Whole House Hvac Filtration Kit (4in)"
brand: "ac infinity"
price: "₨192879"
currency: LKR
in_stock: true
reviews_count: 5
category: "Ac Infinity"
url: https://www.desertcart.lk/products/375478334-ac-infinity-inline-filter-box-with-merv-13-filter-whole
store_origin: LK
region: Sri Lanka
---

# MERV 13 filter blocks 0.3-1.0 micron particles 400 CFM max airflow 1mm cold-rolled steel durability AC Infinity Inline Filter Box with Merv 13 Filter, Whole House Hvac Filtration Kit (4in)

**Brand:** ac infinity
**Price:** ₨192879
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate your air game — because clean air is the new luxury.

## Quick Answers

- **What is this?** AC Infinity Inline Filter Box with Merv 13 Filter, Whole House Hvac Filtration Kit (4in) by ac infinity
- **How much does it cost?** ₨192879 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/375478334-ac-infinity-inline-filter-box-with-merv-13-filter-whole)

## 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

- • **Seamless Integration:** Fits 4-inch inline fans like CLOUDLINE S4/T4 for optimized HVAC performance.
- • **Effortless Maintenance:** Slide-lock door with neoprene seal offers quick, dust-free filter swaps.
- • **Built to Brave the Elements:** Rugged 1mm cold-rolled steel & aluminum flanges ensure weatherproof longevity.
- • **Maximize Airflow Efficiency:** Supports up to 400 CFM to keep your whole house breathing easy.
- • **Breathe Cleaner, Live Better:** MERV 13 filter traps viruses, pollen, dust, and mold spores for fresher indoor air.

## Overview

The AC Infinity Inline Filter Box is a robust whole-house HVAC filtration solution featuring a durable 1mm cold-rolled steel body and aluminum flanges. Designed for 4-inch inline fans, it supports up to 400 CFM airflow and includes a high-efficiency MERV 13 filter that captures fine particles like dust, pollen, mold spores, and viruses. Its slide-lock door with a neoprene seal ensures easy, dust-free filter changes, making it ideal for professionals seeking superior indoor air quality and seamless integration with CLOUDLINE series fans.

## Description

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 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 4” inline fans and enable a streamlined installation to create high efficiency filtration in HVAC and grow applications. Attaching the air filter box in 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. Product Identification Manufacturer AC Infinity Inc. Product Name Air Filter Box 4" Product Model AC-AFB4 UPC Code 819137021693 Product and Mounting Dimensions Duct Opening Size 3.81 in. (9.7 cm) Total Dimensions 23.46 x 8.42 x 11.73 in. (59.6 x 21.4 x 29.8 cm) Flange Size 3.21 in. (8.2 cm) Product Performance and Technical Specs Box Material Steel Flange Material Aluminum Finish Matte Black Filter Size Accepts 12 x 20 x 1” Minimum Airflow Range 80-120 CFM Maximum Airflow 400 CFM Compatible Fan Models CLOUDLINE S4, CLOUDLINE T4 Product Manual Product Manual PDF

Review: Keine Pollen vom Nachbarn mehr , die meine Pflanzen Samen lassen. Wirkt auf den ersten Blick sehr gut verarbeitet. Es ist mein erstes Produkt von AC Infinitiv und ich bin überrascht wie gut es ist.
Review: well made and it works perfectly

## Features

- A duct filter box designed for use with inline fans to circulate fresh air and block contaminants
- 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 MERV 13 filter that traps particles like viruses, dust, pollen, and mold spores
- Fits 4 Inline Fans | 400 CFM Maximum | Accepts 12 x 20 x 1 Filters 23.46 x 8.42 x 11.73

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0921N33Y7 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #203,425 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #118 in Furnace Filters |
| Brand Name | AC Infinity |
| Compatible Device | CLOUDLINE S4, CLOUDLINE T4 |
| Customer Reviews | 4.6 4.6 out of 5 stars (265) |
| Date First Available | 8 May 2021 |
| Item Weight | 6.42 Kilograms |
| Material Type | Alloy Steel, Aluminum, Neoprene |
| Model Info | AC-AFB4 |
| Part Number | AC-AFB |
| Product Dimensions | 2.35 x 1.17 x 0.84 cm; 6.42 kg |

## Product Details

- **Brand:** AC Infinity
- **Compatible devices:** CLOUDLINE S4, CLOUDLINE T4
- **MERV rating:** 13
- **Material:** Alloy Steel, Aluminum, Neoprene
- **Product dimensions:** 59.6L x 21.4W x 29.8Th centimeters

## Images

![AC Infinity Inline Filter Box with Merv 13 Filter, Whole House Hvac Filtration Kit (4in) - Image 1](https://m.media-amazon.com/images/I/41EWnjz-1aS.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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by O***S on 14 October 2025*

Keine Pollen vom Nachbarn mehr , die meine Pflanzen Samen lassen. Wirkt auf den ersten Blick sehr gut verarbeitet. Es ist mein erstes Produkt von AC Infinitiv und ich bin überrascht wie gut es ist.

### ⭐⭐⭐⭐⭐ Review
*by R***K on 28 December 2024*

well made and it works perfectly

### ⭐⭐⭐⭐⭐ Review
*by T***D on 8 October 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.

## 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-20*