{"product_id":"ac-infinity-cloudline-pro-s4-4-inline-duct-fan-quiet-205-cfm-wired-10-speed-controller","title":"AC Infinity CLOUDLINE PRO S4 4\" Inline Duct Fan — Quiet 205 CFM, Wired 10-Speed Controller","description":"\u003cp\u003e\u003cstrong\u003eThe AC Infinity CLOUDLINE PRO S4 is a compact, quiet 4-inch inline duct fan built for efficient ventilation with a wired 10-speed controller and PWM EC motor.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for small grow tents, home ventilation runs, AV rack cooling, and general air transfer, the S4 balances high airflow with low noise and energy use. Its mixed-flow impeller and stator blade design push air effectively through restrictive ducting while dual ball bearings extend service life. The included wired 10-speed controller gives direct manual control and the fan remains compatible with AC Infinity's UIS ecosystem for advanced automated profiles.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the fan stay quiet while moving air?\u003c\/h3\u003e\n\u003cp\u003eThe S4 uses a PWM-driven electronically commutated (EC) motor that runs efficiently at lower temperatures and produces less vibration. A mixed-flow impeller with hydrodynamic blade geometry reduces turbulence so the fan keeps airflow high without loud whine.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePWM EC motor minimizes electrical noise and heat build-up.\u003c\/li\u003e\n  \u003cli\u003eMixed-flow fan design reduces air turbulence for smoother sound.\u003c\/li\u003e\n  \u003cli\u003eDual ball bearings lower mechanical friction and vibration.\u003c\/li\u003e\n  \u003cli\u003eMeasured noise level: approximately 28 dBA at rated conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat environments and setups is this fan best suited for?\u003c\/h3\u003e\n\u003cp\u003eIts compact 4-inch duct size and 205 CFM capacity make the S4 ideal for small to medium enclosed spaces where restricted duct runs or noise are concerns. Use it for ventilating grow tents, moving conditioned air between rooms, exhausting odors, or supplementing AV cabinet airflow.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGrow tents and small indoor gardens where space is limited.\u003c\/li\u003e\n  \u003cli\u003eInline ventilation for bathroom or utility room duct runs.\u003c\/li\u003e\n  \u003cli\u003eCooling electronics, AV racks, and home networking cabinets.\u003c\/li\u003e\n  \u003cli\u003eExhausting odors or circulating conditioned air in tight ducts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I control speed and automation options?\u003c\/h3\u003e\n\u003cp\u003eThe fan ships with a wired 10-speed controller for immediate manual adjustments. For automated schedules, temperature, or humidity-based control, the CLOUDLINE PRO S4 integrates with AC Infinity's UIS controllers and accessories, enabling intelligent programming and environmental triggers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded wired 10-speed knob for quick, precise speed changes.\u003c\/li\u003e\n  \u003cli\u003eCompatible with UIS series controllers for automated profiles.\u003c\/li\u003e\n  \u003cli\u003ePWM input allows clean, responsive speed modulation from controllers.\u003c\/li\u003e\n  \u003cli\u003eWorks with common smart ventilation setups when paired with UIS devices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key specifications I should check before buying?\u003c\/h3\u003e\n\u003cp\u003eConfirm duct size compatibility and that the fan's airflow and sound levels meet your project needs. The S4's compact footprint and performance numbers help determine fit for tight installations or ducted systems with resistance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDuct diameter: 4 inches — fits standard 4\" ducting and adapters.\u003c\/li\u003e\n  \u003cli\u003eDimensions: 6.9 x 11.9 x 7.4 inches — compact inline profile.\u003c\/li\u003e\n  \u003cli\u003eAirflow: 205 CFM — suitable for small to medium ventilation tasks.\u003c\/li\u003e\n  \u003cli\u003eNoise: ~28 dBA — low acoustic signature for discreet use.\u003c\/li\u003e\n  \u003cli\u003eBearings: Dual ball bearings for longer mechanical life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The CLOUDLINE PRO S4 is aimed at hobbyist growers, DIY home ventilators, and AV or electronics enthusiasts who need a small, quiet inline fan with precise speed control. If you want high airflow from a 4\" duct fan with low noise, energy-conscious motor technology, and the option to expand into AC Infinity's UIS automation platform, the S4 is a sensible choice. For larger rooms or higher static pressure systems, consider stepping up to a larger diameter model to match required airflow and duct resistance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the S4 run continuously?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The EC motor and dual ball bearings are designed for continuous operation in ventilation applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will it fit standard 4\" ducting?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The CLOUDLINE PRO S4 is built for 4-inch ducts and works with common 4\" duct connectors and clamps.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AC Infinity","offers":[{"title":"Default Title","offer_id":56843442815316,"sku":"B07JB292JC","price":151.93,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/ac-infinity-cloudline-pro-s4-front-view.jpg?v=1787079830","url":"https:\/\/gardenluxe.co.uk\/products\/ac-infinity-cloudline-pro-s4-4-inline-duct-fan-quiet-205-cfm-wired-10-speed-controller","provider":"Gardenluxe Uk","version":"1.0","type":"link"}