Dual-Speed Fan Control Box

Our Dual-Speed Fan Control Box (SD-FJ series) is a dedicated control solution for fire dual-speed fans requiring high-speed smoke exhaust and low-speed ventilation modes with automatic switching based on fire conditions. Designed for parking garages, shopping malls, and commercial facilities where fans serve both daily ventilation and emergency smoke exhaust functions, this box provides two-speed motor control, circuit protection, fire alarm interface, and mode status indication in a compact enclosure. The dual-speed control enables the fan to operate at low speed for daily ventilation and energy efficiency, then automatically switch to high speed for maximum smoke extraction during fire emergencies. The fire linkage function triggers the high-speed mode upon fire alarm, while the manual/auto selector allows local control for maintenance and testing. Built with robust steel enclosures and control components from Schneider, Siemens, Chint, and Delixi, this control box ensures reliable dual-speed fan operation for combined ventilation and smoke exhaust systems. The SD-FJ series format offers a proven, code-compliant structure tailored to dual-speed fan requirements, making this box ideal for parking garage ventilation, commercial building smoke exhaust, and dual-purpose fan systems.

Yuanzhuo Electrical Equipment manufactures dual-speed fan control boxes strictly to customer drawings and fire code specifications. Our 12,000 m² facility with five automated production lines and an annual capacity of 10,000 units supports both small and large orders. Each box undergoes 100% powered testing, including high/low speed switching simulation and fire linkage verification, before wooden-crate packaging. We support paid samples with a typical development cycle of about one week, and standard delivery of three weeks to one month.

Customization includes motor power rating (high and low speed), speed ratio configuration, control method (pole-changing motor or VFD-based), fire linkage input configuration, automatic switching logic, manual/auto selector type, overload and protection settings, enclosure dimensions, protection grade, installation type, surface color, and customer branding. We manufacture strictly to confirmed customer drawings and fire code specifications.

Each box is film-wrapped and packed in a wooden crate with internal anti-collision padding. We support FOB to a designated Chinese port and EXW. Payment: 40% deposit, 80% after pre-shipment inspection, full balance at the designated Chinese port. Currencies: USD, EUR, RMB.