AC Infinity Inline Duct Silencer | 4-Inch

Quick Spec: 4" duct opening | 14.96 x 6.97 in. total dimensions | 15 in. length | 1.50 in. stainless steel reversible flanges | Neoprene egg-crate foam core | Galvanized steel body | 2.30 lbs | UPC: 819137021051

Precision Control in Any Space

Every ventilation circuit carries a hidden liability: the mechanical noise and vibration generated by inline fans that travels through bare duct connections, through walls, and into adjacent spaces. In a controlled-environment cultivation room, that persistent acoustic signature is not a minor inconvenience — it is a signal that energy is escaping the system unmanaged, that vibration is stressing duct joints and fan housings, and that the operator has no acoustic boundary between the mechanical infrastructure and the production environment. Uninsulated connections allow fan harmonics to propagate freely, making it impossible to isolate whether noise complaints, structural fatigue, or ambient stress on the environment originate from the ventilation system itself. The status quo is a circuit that fights back every time the fan runs.

After the AC-DSA4 is integrated into the ventilation chain, the acoustic profile of the facility changes measurably. Fan noise no longer bleeds through duct walls into adjacent rooms. Vibration generated at the fan housing is absorbed before it can travel downstream into rigid ducting. The mechanical infrastructure recedes into the background, and the operator's attention can return to environmental parameters that actually drive production outcomes — temperature, humidity, CO2, and photoperiod — rather than managing complaints about equipment noise or chasing vibration-induced duct leaks.

The mechanism behind that outcome is a purpose-built acoustic attenuation assembly: a galvanized steel body rated for corrosion resistance and extreme temperature tolerance, lined internally with high-quality neoprene foam in an egg-crate pattern that disrupts and absorbs sound wave propagation through the duct. Dual aluminum flanges at each end absorb residual vibration from fan operation and airflow turbulence before it can transfer into the connected duct run. The reversible stainless steel flange design — 1.50 in. (3.8 cm) in length — allows installation in any orientation within the ventilation chain, including between the fan and ducting, on intake, or on exhaust, without restricting airflow passthrough. The total assembly measures 14.96 x 6.97 in. (38.0 x 17.7 cm) and weighs 2.30 pounds. In practical terms, the AC-DSA4 delivers up to 50% noise reduction across a standard 4-inch ventilation circuit at a 15-inch installed length with full bidirectional airflow compatibility.

Where This Belongs (and Doesn't)

The AC-DSA4 is a passive acoustic component. It does not regulate airflow volume, filter particulates, or provide electrical isolation. Integration into any ventilation circuit should be evaluated against the total static pressure budget of the system. Consult a qualified HVAC or mechanical systems professional for installations involving pressurized plenums, fire-rated assemblies, or code-governed commercial ductwork.

How It Works

Fan noise in a ventilation circuit propagates through two distinct pathways: airborne sound waves that travel through the duct interior, and structure-borne vibration that transfers through the physical connection between the fan housing and the duct wall. Addressing only one pathway leaves the other active. The AC-DSA4 is designed to interrupt both simultaneously within a 15-inch installed footprint.

The internal lining of high-quality neoprene foam in an egg-crate pattern is the primary airborne attenuation mechanism. The irregular surface geometry of the egg-crate profile disrupts coherent sound wave propagation by creating multiple reflection and absorption events as air moves through the silencer body. Neoprene's acoustic damping properties are well-suited to the temperature and humidity conditions present in cultivation and HVAC environments, maintaining performance without degradation from moisture exposure. The galvanized steel body provides the structural rigidity necessary to prevent the silencer from becoming a resonant element in the circuit — a failure mode common in lightweight or thin-walled acoustic wraps.

Structure-borne vibration is addressed at the connection points. The dual aluminum flanges at each end of the assembly are engineered to absorb vibration energy from fan operation and airflow turbulence before it can transfer into the connected duct run. The reversible stainless steel flange design — 1.50 in. (3.8 cm) flange length — allows the operator to orient the silencer in either direction without loss of function, and supports installation at any point in the ventilation chain: between fan and ducting, at the intake, or at the exhaust outlet. Maximum airflow passthrough is maintained in both intake and exhaust configurations, meaning acoustic attenuation is achieved without imposing a meaningful static pressure penalty on the fan. In practical terms, the AC-DSA4 delivers up to 50% noise reduction through a corrosion-resistant, temperature-tolerant assembly measuring 14.96 x 6.97 in. (38.0 x 17.7 cm) and weighing 2.30 pounds, compatible with any standard 4-inch ventilation circuit.

System Integration

• Fan Compatibility: Designed for use with 4-inch inline extractor fans; install between the fan outlet and the downstream duct run for maximum vibration isolation at the source.
• Orientation Flexibility: Reversible flange design supports installation in either airflow direction — intake or exhaust — without reconfiguration or performance loss.
• Duct System Position: Can be placed at any point in the ventilation chain; positioning immediately downstream of the fan yields the greatest reduction in structure-borne vibration transfer.
• Airflow Compatibility: Maximum airflow passthrough maintained in both intake and exhaust configurations; no active restriction of CFM output from the connected fan.
• Multi-Unit Deployment: In facilities running multiple 4-inch ventilation circuits, one AC-DSA4 per circuit is the standard deployment configuration for consistent acoustic attenuation across the installation.

Facility Integration Data

The following table provides a reference for procurement planning across multi-circuit facility deployments, based on a per-unit MAP of $49.99.

Operator Field Notes

• Install position matters: Placing the AC-DSA4 directly at the fan outlet — between the fan and the first rigid duct section — intercepts vibration at the source before it can couple into the duct structure. Downstream placement still attenuates airborne noise but reduces the vibration isolation benefit.
• Flange orientation: The reversible stainless steel flanges allow either end to connect to the fan or duct side. Verify that the 4-inch flange seats fully and securely before securing with duct clamps or tape — a partial seat will create an air gap that undermines both acoustic and airflow performance.
• Neoprene foam inspection: Periodically inspect the internal foam lining for compression set or moisture saturation in high-humidity cultivation environments. Saturated foam loses acoustic absorption efficiency and should be addressed to maintain rated performance.
• Do not compress the body: The galvanized steel body maintains the internal geometry necessary for the egg-crate foam to function. Do not install the silencer in a position where external mechanical load compresses the body — this collapses the foam profile and reduces attenuation.
• Weight consideration: At 2.30 pounds, the AC-DSA4 adds meaningful mass to the fan connection point. In suspended fan installations, verify that the mounting hardware and duct hangers are rated to support the combined weight of the fan, silencer, and connected duct run.
• Multi-circuit consistency: In facilities with multiple 4-inch circuits, deploy one AC-DSA4 per circuit. Selectively silencing only some circuits creates an uneven acoustic profile that can make the remaining unsilenced circuits more perceptible by contrast.

Shipping & Logistics

• Shipping Territory: Cannafull Spectrum Solutions ships within the contiguous 48 United States only. Orders outside this territory cannot be fulfilled.
• Fulfillment: Orders are processed and shipped from authorized distribution points. Estimated transit times will be provided at checkout based on destination.
• Returns: Returns are accepted for defective or damaged units in accordance with our Return Policy. Non-defective returns are subject to the conditions outlined at cannafullspec.com/pages/return-policy.
• Restocking Fee: Returns of non-defective items are subject to a restocking fee of up to 25% per our Return Policy. Review full terms at cannafullspec.com/pages/return-policy before ordering.

For order support, volume procurement, or pre-purchase technical questions: support@cannafullspec.com

What's in the Box

• 1x AC Infinity Duct Fan Silencer 4" (SKU: AC-DSA4)

Box contents confirmed from manufacturer product data. If your shipment is missing any components or contains a damaged unit, contact support@cannafullspec.com immediately with your order number and photographic documentation of the received condition.

Regional Compliance & Deployment Notes

• Jurisdiction: The AC-DSA4 is sold and shipped within the contiguous 48 United States only through Cannafull Spectrum Solutions.
• Electrical Classification: The AC-DSA4 is a passive mechanical component with no electrical connections, control interfaces, or power requirements. It does not require electrical certification for standard ventilation circuit installation.
• Building Code Applicability: Installation in commercial, industrial, or multi-tenant facilities may be subject to local mechanical codes governing ductwork modifications. Verify compliance with applicable local codes before installation in governed environments.
• Fire-Rated Assembly Exclusion: The AC-DSA4 has not been evaluated for installation within fire-rated plenum or duct assemblies. Do not install in fire-rated assemblies without review by a qualified mechanical engineer or authority having jurisdiction.
• UPC: 819137021051 | Manufacturer: AC Infinity Inc.

Compliance determinations are the responsibility of the purchasing operator. Cannafull Spectrum Solutions provides product specifications as published by the manufacturer and does not provide code compliance certification. Consult a licensed mechanical contractor or authority having jurisdiction for installation in regulated commercial environments.