Installing a kitchen hood extractor involves mounting, electrical connection, and often ducting work if it vents outside rather than recirculating air.
| Service | Estimated Cost Range (KES) |
|---|---|
| Site assessment | 500 – 1,500 |
| Wall/ceiling mounting | 2,000 – 5,000 |
| Electrical connection | 1,500 – 3,500 |
| Ducting installation (vents outside) | 3,000 – 10,000 |
| Recirculating filter setup (no ducting) | 1,500 – 3,000 |
| Full installation package | 5,000 – 15,000 |
Ducted extractors cost more to install than recirculating ones because of the extra piping and wall or ceiling work needed to vent air outside, but they tend to clear smoke and odours more effectively.
Hood Extractor Installation Process
Installing a hood extractor—also known as a kitchen extractor fan or range hood—is one of the most impactful upgrades you can make to a kitchen. It removes smoke, steam, grease, and cooking odors, improving indoor air quality and protecting walls and ceilings from grime buildup. While the exact steps vary depending on the hood type (ducted vs. recirculating, wall-mounted vs. island), the core process follows a logical sequence: planning, preparation, mounting, ducting or filtering, electrical connection, and testing. This article walks through the complete installation process with a focus on best practices for safety, efficiency, and long-term performance.
Planning and Preparation
Before any physical work begins, careful planning is essential. Start by selecting the right hood for your kitchen layout and cooking habits. Ducted hoods vent air outside and are generally more effective, while recirculating models filter and return air indoors—ideal where external venting isn’t possible. Confirm the hood’s width matches or exceeds your cooktop’s width for optimal capture.
Next, assess the installation location. For wall-mounted hoods, the ideal height is typically 65–75 cm above electric hobs and 70–80 cm above gas hobs. Island hoods require ceiling mounting directly above the cooktop. Check local building codes and landlord or strata rules, especially in apartments, as some jurisdictions restrict external ducting or require specific fire-rated materials.
Gather all necessary tools and materials: drill, screws, wall plugs, spirit level, measuring tape, screwdrivers, wire strippers, electrical tape, ducting (for vented models), grease filters, and possibly a hole saw for wall or ceiling penetrations. Ensure the power is switched off at the circuit breaker before handling any wiring.
Mounting the Hood
Accurate mounting ensures both functionality and aesthetics. Begin by marking the hood’s position on the wall or ceiling. Use a spirit level to ensure the unit will be perfectly horizontal—misalignment can cause uneven airflow and visible gaps. For wall-mounted models, hold the mounting bracket against the wall, mark the screw holes, and drill pilot holes. Insert appropriate wall plugs (masonry for brick/concrete, fixings for stud walls) and secure the bracket firmly.
If the hood includes a chimney or decorative cover, assemble it according to the manufacturer’s instructions before final mounting. Some models require the main body to be hung first, with the chimney attached afterward. Always follow the specific manual, as designs vary significantly.
For island hoods, ceiling reinforcement may be necessary. Locate ceiling joists and anchor the mounting plate directly into them or install a plywood backer between joists for added support. The hood must bear its own weight plus vibration from the fan—never rely solely on drywall anchors.
Ducting and Ventilation (For Ducted Models)
If installing a ducted hood, this is the most critical phase. The goal is to create the shortest, straightest path to the outside with minimal bends, as each 90-degree turn reduces airflow efficiency by up to 10%. Use rigid metal ducting (aluminum or galvanized steel) rather than flexible plastic, which traps grease and restricts flow.
Measure the distance from the hood’s exhaust outlet to the external wall or roof. Cut the ducting to size, ensuring snug fits at all joints. Seal connections with aluminum foil tape—not duct tape, which degrades under heat. Install a backdraft damper at the external vent to prevent cold air or pests from entering when the fan is off.
When cutting through walls or ceilings, use a hole saw sized to your duct diameter. For external walls, fit a weatherproof vent cap with a insect screen. Roof penetrations require additional flashing and sealing to prevent leaks—consider hiring a professional if you’re unfamiliar with roofing work.
Recirculating models skip ducting entirely but require high-quality carbon filters in addition to standard grease filters. These must be replaced every 3–6 months depending on usage.
Electrical Connection
Safety is paramount during electrical work. Most hoods require a dedicated 13-amp circuit or a hardwired connection to a fused spur. If your model comes with a plug, ensure the socket is easily accessible and not behind the hood. For hardwired units, connect live (brown), neutral (blue), and earth (green/yellow) wires to the corresponding terminals in the junction box, following the wiring diagram provided.
All connections must be secure and insulated. Use wire nuts or terminal blocks, then wrap with electrical tape for added protection. If you’re not confident working with mains electricity, engage a qualified electrician—improper wiring poses fire and shock hazards.
Final Assembly and Testing
Once mounted and wired, attach grease filters, light covers, and any decorative panels. Double-check that all screws are tight and the hood is stable. Restore power at the circuit breaker and test all functions: fan speeds, lights, and any smart features like motion sensors or auto modes.
Run the hood at maximum speed for a few minutes while cooking or using a smoke test (e.g., holding a lit match near the cooktop) to verify effective extraction. Listen for unusual vibrations or rattling, which may indicate loose parts or ducting issues. Adjust fan balance or tighten mounts as needed.
Maintenance Considerations
Proper installation sets the stage for easy maintenance. Clean grease filters monthly by soaking in warm, soapy water or running through a dishwasher (if dishwasher-safe). Wipe the hood’s exterior with a degreaser to prevent buildup. For ducted systems, inspect external vents annually for blockages like bird nests or leaves.
A well-installed hood extractor not only enhances kitchen comfort but also extends the life of your cabinetry and paintwork by reducing exposure to heat and moisture. Taking time to plan, execute precisely, and test thoroughly ensures years of reliable performance.
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