what filter fits perfect in the 4" filter box?

the 4" and 6" filters take 12x20x1" filters; the 8 and 10" box's take 14x20x1" filters

What filter replacement is suggested for the 6" filter box? standard 20x12x1 does not fit.

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.

Do the filters trap smoke from pipes or pollen and mildew?

No, you need a carbon filter for smoke

Can I use a MERV 17 or HEPA filter instead of a MEV13 filter for additional filtration if they will even fit?

I use the HDX FPR 12 Ultimate Allergen with odor reduction. This filter is a higher end filter.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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 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

Product ID: 312123344

Details

Brand
AC Infinity
Compatible Devices
CLOUDLINE S4
Item Weight
6.42 Kilograms
MERV Rating
13
Manufacturer
AC Infinity
Material
Alloy Steel

🧼MERV 13 high efficacy filter traps fine particles

🌬️400 CFM max airflow for powerful ventilation

🛡️1mm thick cold-rolled steel for durability

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₪873

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In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
AC Infinity
Compatible Devices
CLOUDLINE S4
Item Weight
6.42 Kilograms

Description

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

SEAMLESS INTEGRATION - Fits perfectly with 4-inch inline duct fans like CLOUDLINE S4 & T4 for optimized fresh air intake.
EFFORTLESS MAINTENANCE - Slide lock door with neoprene seal offers quick, dust-free filter changes without hassle.
BREATHE CLEANER LIVE BETTER - Includes a MERV 13 filter that captures dust, lint, odors, and PM 2.5 particles for healthier indoor air quality.
POWERFUL AIRFLOW ZERO COMPROMISE - Supports up to 400 CFM airflow, balancing high performance with quiet operation.
BUILT TO LAST ENGINEERED TO PERFORM - Heavy-gauge alloy steel construction ensures weatherproof durability and long-term reliability.

The AC Infinity Inline Filter Box 4" is a robust HVAC filtration solution designed for 4-inch inline duct fans. Crafted from 1mm thick cold-rolled alloy steel with aluminum flanges, it withstands extreme conditions while delivering up to 400 CFM airflow. Equipped with a MERV 13 high efficacy filter, it effectively traps dust, dirt, lint, odors, and fine particles like PM 2.5, ensuring cleaner, healthier indoor air. Its slide lock door and neoprene seal enable easy, dust-free filter maintenance, making it an ideal upgrade for whole-house ventilation systems.

Specifications

ASIN	B0921N33Y7
Best Sellers Rank	#54,322 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #327 in Furnace Filters
Brand	AC Infinity
Brand Name	AC Infinity
Compatible Devices	CLOUDLINE S4, CLOUDLINE T4
Customer Reviews	4.6 out of 5 stars 324 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
Manufacturer Part Number	AC-AFB
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

Reviews

T**D

8.10.2025

R**H

18.04.2026

M**S

3.12.2023

M**H

14.02.2026

D**D

22.05.2021

R**N

9.11.2023

N**M

30.12.2022

J**T

24.03.2024

O**S

14.10.2025

R**B

17.02.2026

S**D

4.02.2026

R**K

28.12.2024

A**S

27.12.2025

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