Grower Tip
- Fit it at the start of your intake duct run so incoming air is filtered before it reaches the tent.
- Pair it with a high static pressure fan — the Cloudline S4 and T4 are the matched 100mm models.
- Seal every duct joint with aluminium tape, and insulate the box where warm and cold air meet to reduce condensation.
- Mount it with the door facing an accessible side — filter swaps take seconds through the slide-lock hatch.
Features
Works with inline duct fans to pull filtered fresh air in, blocking dust before it enters.
The included high-efficacy pleated filter traps dust, dirt, lint and welding fumes.
1mm cold-rolled steel body with aluminium flanges and matte black powder coat.
Hinge-sealed slide-lock door with a neoprene seal that keeps dust out and makes swaps easy.
Accepts off-the-shelf 12 x 20 x 1-inch MERV pleated filters.
59.6 x 21.4 x 29.8cm, fits 4-inch fans (Cloudline S4/T4), rated 80–400 CFM.
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1
Power down
Disconnect power to any fans or appliances you'll be connecting the filter box to.
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2
Position the box
Fit it between your inline fan and ductwork, remove the plastic wrap from the filter, and keep the door accessible.
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3
Seal the joints
Use aluminium tape to completely seal the duct connections.
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4
Insulate if needed
If warm and cold air meet at the box, line its interior with insulation to reduce condensation.
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5
Maintain it
Wipe the inner walls with a damp cloth and slide a fresh 12 x 20 x 1-inch filter into the slot when the old one is dirty.
Which fans does it fit?
The box's aluminium flanges are sized for 100mm (4-inch) ducting, and the Cloudline S4 and Cloudline T4 are the matched fan models. It's rated for 80–120 CFM minimum through to 400 CFM maximum — use a high static pressure fan to keep airflow strong through the filter.
What filters does it take?
It ships with a high-efficacy pleated filter that captures 90% of particles from 0.3 to 1.0 microns — dust, dirt, lint and welding fumes. When it's spent, any standard 12 x 20 x 1-inch MERV pleated filter slides straight into the slot through the slide-lock door, so replacements are cheap and easy to find.
Is it for intake or exhaust?
It's built for intake. Fit it at the starting end of your duct run so the fan pulls outside air through the filter before it enters your grow space or home — it's designed to cut suspended particles in whole-house, HVAC and grow applications alike.
Does it replace a carbon filter?
They do different jobs. The filter box cleans incoming air, trapping dust and other particles before they reach your plants; a carbon filter scrubs odour from the air your fan exhausts. In a sealed grow space the two work as a pair — filtered intake on one side, carbon-filtered exhaust on the other.
How do I stop condensation inside it?
Condensation can form when the air passing through the box is much warmer or colder than the room it sits in. Line the inside of the box with insulation to reduce or eliminate it — worth doing if you're drawing cool outside air into a warm room.
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.
KEY FEATURES
- A duct filter box designed for use with inline fans to circulate fresh air and block dust and odours.
- Built with 1mm thick cold-rolled steel and aluminium 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 Identification AIR FILTER BOX 4 INCH / 100 MM | |
| 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 |
Specifications
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