{"product_id":"ac-infinity-cloudline-s4-4-inline-duct-fan-quiet-205-cfm-10-speed-controller-28-dba","title":"AC Infinity CLOUDLINE S4 4\" Inline Duct Fan — Quiet 205 CFM, 10-Speed Controller, 28 dBA","description":"\u003cp\u003e\u003cstrong\u003eThe AC Infinity CLOUDLINE S4 is a compact, whisper-quiet 4-inch inline duct fan with a 10-speed wired controller designed for efficient ventilation in grow tents, AV racks, and small rooms.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for environments where airflow, low noise, and energy efficiency matter, the CLOUDLINE S4 pairs a PWM-controlled EC motor with a mixed-flow impeller to move up to 205 CFM while running as low as 28 dBA. Its small footprint and dual-ball bearings ensure long-lasting operation, and the included wired speed controller gives you ten discrete speed settings for fine-tuned ventilation without extra accessories.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the CLOUDLINE S4 perform in tight spaces or high-resistance duct runs?\u003c\/h3\u003e\n\n\u003cp\u003eThe mixed-flow design, combining stator blades and hydrodynamic wind circles, helps maintain steady airflow even when ducts or filters add resistance. This design pushes air more effectively than conventional axial fans in pressurized conditions, so you keep circulation without oversizing the unit.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eAirflow up to 205 CFM for strong ventilation in small systems\u003c\/li\u003e\n  \u003cli\u003eMixed-flow impeller improves pressure handling in restrictive ducts\u003c\/li\u003e\n  \u003cli\u003eCompact dimensions (6.9 x 11.9 x 7.4 in) fit congested installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs the CLOUDLINE S4 quiet and energy-efficient enough for living spaces?\u003c\/h3\u003e\n\n\u003cp\u003eYes—its PWM-controlled EC motor minimizes electrical losses and heat, so the fan runs efficiently at lower speeds. At normal operating levels the unit can be nearly silent (rated 28 dBA), making it suitable for bedrooms, offices, or media closets where noise matters.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNoise rating as low as 28 dBA for unobtrusive operation\u003c\/li\u003e\n  \u003cli\u003eEC motor with PWM control for lower energy consumption\u003c\/li\u003e\n  \u003cli\u003eDual ball bearings for reliable, low-friction rotation over time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat control options and compatibility does the fan offer?\u003c\/h3\u003e\n\n\u003cp\u003eThe CLOUDLINE S4 ships with a wired 10-speed controller that provides immediate manual adjustment across a wide range. For more advanced scheduling or automation, it’s compatible with AC Infinity’s UIS controllers which add intelligent programming and environmental feedback.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncluded wired 10-speed controller for simple, instant control\u003c\/li\u003e\n  \u003cli\u003eCompatible with UIS controllers for timers, thermostats, and humidity control\u003c\/li\u003e\n  \u003cli\u003eMultiple speed steps let you balance airflow and acoustics precisely\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and serviceable is the fan for continuous operation?\u003c\/h3\u003e\n\n\u003cp\u003eThe CLOUDLINE S4 uses dual ball bearings and a robust housing to handle continuous duty cycles in demanding setups. With proper installation and periodic cleaning, the fan is built to provide years of consistent ventilation without frequent maintenance.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDual ball bearings for longer life and stable performance\u003c\/li\u003e\n  \u003cli\u003eSturdy mixed-flow housing that resists vibration and wear\u003c\/li\u003e\n  \u003cli\u003eEasy-to-access controller and mounting points for straightforward upkeep\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The AC Infinity CLOUDLINE S4 is ideal for hobby growers, home theater or AV installers, and anyone needing a compact, quiet inline fan for small to medium enclosures. Choose this model when you want a balance of strong airflow, low noise, and the flexibility of manual or UIS-compatible control in a small footprint.\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 CLOUDLINE S4 run continuously?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It’s designed for continuous operation using dual ball bearings and an efficient EC motor for long-lasting, low-maintenance performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this fan work with thermostats or humidity controllers?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It works with AC Infinity UIS controllers for automated temperature and humidity control, in addition to the included 10-speed wired controller.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AC Infinity","offers":[{"title":"Default Title","offer_id":54210211774648,"sku":"B07JB292JC","price":221.51,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/0636\/7416\/files\/ac-infinity-cloudline-s4-front-view.jpg?v=1790676529","url":"https:\/\/canadianlawn.ca\/products\/ac-infinity-cloudline-s4-4-inline-duct-fan-quiet-205-cfm-10-speed-controller-28-dba","provider":"Canadian Lawn","version":"1.0","type":"link"}