The HDFS3P1‑W‑L Humidity Sensor and Fan Control from Cooper Wiring Devices (Eaton) is an advanced, automatic ventilation control solution designed to improve indoor air quality, protect against mold and mildew, and enhance energy efficiency. This single‑pole wall‑mounted device continuously monitors ambient humidity levels and activates a connected ventilation fan whenever humidity rises above a preset threshold—perfect for bathrooms, laundry rooms, basements, and other moisture‑prone spaces.

Featuring three selectable humidity levels, the HDFS3P1‑W‑L adjusts to the specific moisture conditions of the room, ensuring proper ventilation without unnecessary fan runtime. The control also includes a manual ON / automatic OFF mode, allowing immediate ventilation when needed. Once humidity returns to acceptable levels, the sensor automatically shuts off the fan, helping to reduce energy consumption.

Its flush‑mount design, clean white finish, and durable construction make this control a seamless addition to modern interiors. Built to Eaton’s reliability standards, it provides dependable operation and meets rigorous UL/cUL requirements.

Key Features

• Automatic Humidity‑Based Ventilation: Turns the fan ON when humidity exceeds the preset threshold and OFF when levels drop, helping prevent mold and mildew. 
• Three Adjustable Humidity Settings: Choose from High (80% RH), Medium (65% RH), or Low (45% RH) depending on the moisture level of the space. 
• Manual Fan Operation: Manual ON mode allows immediate ventilation; fan turns OFF automatically after a built‑in time delay. 
• Automatic Shutoff Delay: Fan run‑on time of 20–30 minutes depending on the operating mode, ensuring adequate moisture removal.
• Helps Prevent Mold and Mildew: Designed specifically for damp environments like bathrooms, spas, and laundry areas.
• Energy‑Efficient: Reduces unnecessary fan runtime by operating only when humidity requires it. 
• Flush‑Mount Design: Replaces a standard single‑pole wall switch for a clean, integrated appearance. 
• Durable Construction: Built with high‑quality components for long‑term reliability. 
• Indoor Use: Suitable for residential and light‑commercial humidity control applications. 

Specifications

• Electrical Rating: 15A, 120V AC, 60 Hz 
• Maximum Fan Load: 3A / 1⁄4 HP motor 
• Humidity Detection Range: 45%–80% RH 
• Humidity Preset Levels: 45% (Low), 65% (Medium), 80% (High) 
• Fan Time Delay: 20–30 minutes depending on mode 
• Wiring: Red (Fan), Black (Hot), White (Neutral), Green (Ground) — Neutral required 
• Mounting: Flush‑mount in standard wall box
• Control Type: Single‑pole
• Color: White (W‑L suffix) 
• Certifications: UL/cUL Listed; compliant with ventilation control safety standards 

Applications

Residential

• Bathrooms & powder rooms
• Laundry rooms
• Basements
• Home spas
• Utility areas

Light Commercial

• Hotel bathrooms
• Condominiums & apartment ventilation
• Fitness centers & locker rooms
• Small office restrooms

Benefits

• Prevents lingering moisture and condensation
• Reduces odors and improves indoor air quality
• Enhances fan lifespan by limiting excessive runtime
• Increases energy efficiency by automating ventilation