An extractor fan is a mechanical ventilation device designed to remove stale air, smoke, moisture, fumes, or odors from a room or space, replacing it with fresh air from outside
Specifications
Specification / Attribute
Common Range / Typical Values
Airflow / Extraction Capacity
• For small rooms (bathroom, small kitchen): ~ 50–200 m³/h (or ~ 30–120 CFM) • For medium‑size kitchens: ~ 200–500 m³/h • For larger areas, commercial or heavier ventilation needs: higher — depending on fan and ducting.
Power Consumption (Motor Wattage)
~ 8–50 W for typical household/extraction fans. Larger / more powerful / industrial‑type extractor fans may require substantially more power depending on motor and airflow needs.
Noise Level
~ 20–50 dB for quieter residential fans; if used in a kitchen or heavier‑duty installation, noise can go higher (some larger fans may be noticeably louder)
Fan (Impeller) Size / Mounting Diameter
Small domestic / window or wall‑mounted units: typical housing/diameter ~ 100–150 mm (for small bathrooms/kitchens) Larger fans for bigger rooms / commercial or industrial use: depending on design — may use larger blades or duct‑mounted assemblies.
Air Pressure / Static Pressure Capacity
For ducted installations or longer duct runs, fans should offer enough pressure to overcome duct resistance; small fans handle only short straight ducts.
Motor Type & Build
Typically single‑phase AC motor (for residential/wall/fan‑unit types), sometimes with capacitor start; industrial fans may use heavier‑duty motors and robust metal impellers.
Construction / Materials
Plastic (e.g. ABS or similar) housings for small residential units: light, corrosion‑resistant, easy to clean. For heavier‑duty fans: metal bodies, metal blades/guards for durability.
Installation Types
Wall-mounted, ceiling-mounted, window-mounted, or ducted (inline) depending on room layout and ventilation requirements. Could be ducted to outside or recirculating depending on fan design and purpose.
Optional Features (depending on model)
• Back‑draft shutter / damper (prevents outside air or pests entering when fan is off) • Timer or over‑run (fan runs some minutes after switch-off) — common in bathrooms or humid areas. • Humidity sensor or automatic activation (especially useful in bathrooms, laundries, or wet environments) • Duct compatibility: standard residential ducts often 4–6 inch diameter; bigger fans may require larger ducts for efficient airflow.
