- 1x 4" Air Filter Box
- 1x MERV 13 High-Efficacy Filter (12" x 20" x 1")
AC Infinity 4" High Efficacy Air Filter Box
- Maximum airflow rates up to 400 CFM
- Constructed from cold-rolled steel and aluminum
- Compatible with 4-inch inline fans like Cloudline T4 and S4 models
- 2-year warranty, excluding non-durable consumables
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- You are keeping your ventilation system clean because airborne contaminants can harm your plants and equipment.
- You are filtering intake or exhaust air because you want a constant supply of clean air in your grow room.
- The simple sliding door allows for quick and tool-free filter replacement.
- Growers who installed these on their intake fans say they spend significantly less time cleaning dust off their equipment.
- Users who added this to their exhaust lines report that the filtration setup keeps their room output clean without a noticeable drop in fan performance.
AC Infinity 4" High Efficacy Air Filter Box
Tired of airborne contaminants like dust, pollen, and spores compromising your grow room's environment? The AC Infinity 4" Air Filter Box is the definitive solution for ensuring a constant supply of clean air. This unit seamlessly integrates into your ventilation system to filter either intake or exhaust air, protecting your plants and equipment from harmful particles.
Engineered for maximum efficiency and durability, this filter box is a crucial component for any serious grower looking to maintain pristine conditions. It's an essential upgrade for the entire AC Infinity ecosystem, ensuring your ventilation works smarter, not harder. By capturing unwanted particles before they enter your space, you can prevent issues and promote healthier, more vigorous growth.
What's Included
Features




Superior Air Purification
Captures dust, pollen, and odors with its included MERV 13 high-efficacy filter.
Heavy-Duty Build
Constructed from cold-rolled steel and aluminum to withstand harsh grow room conditions.
Effortless Filter Swaps
Features a simple sliding door for quick and tool-free filter replacement.
Optimized Airflow
Engineered to maintain high airflow rates up to 400 CFM, minimizing performance loss.
Versatile Compatibility
Accepts any standard 12" x 20" x 1" filter, offering flexibility in filtration media.
Specifications
| Specification | Value |
|---|---|
| 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) |
| Box Material | Cold-Rolled Steel |
| Flange Material | Aluminum |
| Finish | Matte Black Powder Coat |
| Accepted Filter Size | 12” x 20” x 1” |
| Maximum Airflow | 400 CFM |
| Compatible Fan Models | CLOUDLINE S4, CLOUDLINE T4 |
Support & Manuals
Warranty
This AC Infinity product comes with a two-year warranty. Please note this does not cover non-durable goods or consumables designed to be replaced, such as the air filter itself.
FAQs
It's designed to be installed in your ventilation line to filter incoming or outgoing air. It effectively removes dust, pollen, pet dander, and other airborne particles to maintain a clean environment for your plants.
This model is specifically designed for 4-inch ducting and pairs perfectly with 4-inch inline fan systems like the AC Infinity Cloudline T4.
Filter life depends on the air quality and usage. For typical grow environments, we recommend checking the filter every 1-2 months and replacing it every 3-6 months or when you notice a significant drop in airflow.
Yes, the box is designed to accept any standard 12" x 20" x 1" filter, including various MERV-rated options, giving you complete flexibility.
While its primary function is filtration, the insulated steel construction can help slightly dampen noise. For significant noise reduction, we recommend pairing it with an AC Infinity Duct Silencer.
For a comprehensive overview, check out our in-depth guide on AC Infinity grow tents and air filter kits. It covers everything you need to know to create the perfect environment.
Questions About This Product?
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
Why Trimleaf
Equipping home growers, craft producers, and commercial operations across North America since 2016.