Exhaust Fan Installation in Kathmandu: Cost & Wiring

Exhaust fan installation in Kathmandu: what the job involves

Exhaust fan installation in Kathmandu is more than screwing a plastic box into a wall. A correct job covers fan sizing for the room, a dedicated switch and cable run from the distribution board, a duct or louvre vent so the moist air actually leaves the building, and placement that stays clear of switches, mirrors and water outlets. Bathrooms and kitchens are treated as moisture zones, so the circuit needs its own MCB and a working earth connection. SDR Smart Design and Repair fits exhaust fans across Kathmandu, Lalitpur and Bhaktapur, normally in a single visit once the hole position is confirmed.

Getting the install right matters because a badly placed or under-powered fan simply moves damp air around the room. Persistent moisture on bathroom walls peels paint, blackens silicone and feeds mould behind cupboards — damage that costs far more to fix than doing the fan properly the first time.

Bathroom exhaust fan cost in Nepal (2026 pricing)

The bathroom exhaust fan cost in Nepal has two parts: the fan itself and the electrical work. A basic 150–200 mm bathroom fan costs Rs 2,500–5,000 to buy; larger 8-inch units for master bathrooms run Rs 4,500–8,000. Installation labour on an existing wired point is Rs 1,200–2,000. If no point exists, running a new fan point from the DB with a wall switch adds Rs 1,800–3,000. Ducting, one-way louvres and the wall sleeve are priced separately because drilling through an RCC slab is slower than cutting a cavity wall.

• 6-inch bathroom exhaust fan (150–200 mm): Rs 2,500–5,000 supply
• 8-inch fan for larger bathrooms: Rs 4,500–8,000 supply
• Supply plus labour on an existing point: Rs 1,200–2,000
• New wiring point from DB with switch: Rs 1,800–3,000
• Wall duct, louvre or one-way vent: Rs 800–2,000
• Kitchen exhaust with ducting installed: Rs 5,000–12,000

Kitchen exhaust fan wiring in Nepal: moisture zones explained

Kitchen exhaust fan wiring in Nepal follows the same safety logic as bathroom wiring: anything within the splash zone gets no socket, and the switch stays outside it. Electricians split a wet room into zones. The area directly above a shower, bath or sink is the wettest zone — no outlets, no joints, no junction boxes there. Cables reach the fan by concealed conduit or surface channel from the switch side of the room, and the whole circuit is protected by a separate MCB in the DB, ideally with earth leakage protection.

Kitchen cooking vapour adds grease to the moisture, so use a fan rated for grease-laden air and clean its filter monthly. Fan size for kitchens starts at 8 inches; large kitchens with a chimney use a ducted unit vented straight outside rather than a recirculating one. If your kitchen still has old aluminium wiring or a shared un-earthed circuit, fix that first — check the numbers in /blog/house-wiring-cost-nepal, or book the circuit work through /services/wiring-rewiring before the fan goes in.

How to size an exhaust fan for your bathroom or kitchen

Sizing is simple arithmetic: volume of the room multiplied by air changes per hour (ACH), divided by 60, gives the airflow you need in cubic metres per minute. A bathroom should hit 15–20 air changes per hour; a kitchen 15–30 with heavy frying. Example: a 2.5 m × 2.0 m bathroom with a 2.4 m ceiling is 12 cubic metres — at 15 ACH you need 180 cubic metres per hour of rated airflow, which a standard 6-inch fan delivers. Undersized fans run constantly, wear out faster and still leave mirrors wet.

• Bathroom: 15–20 air changes per hour
• Kitchen: 15–30 air changes per hour
• Calculate airflow: (length × width × height × ACH) ÷ 60
• Duct runs over 3 metres or with two bends: step up one fan size
• Always vent outside — recirculating units only move the problem

DIY vs professional exhaust fan installation

DIY makes sense only in a narrow case: you are swapping an identical fan onto an existing working point, the hole size matches, and you can isolate the circuit at the MCB and confirm it is dead before touching a terminal. Plastic-bodied bathroom fans on a low-watt motor are within handyman range. Stop and call a professional when the job involves cutting a new hole through an RCC slab or brick wall, running fresh cable from the distribution board, working in a false ceiling, connecting near water without proper earthing, or any time you cannot positively verify the power is off.

Professional installation also protects the warranty: many fans void their cover if fitted without a licensed electrician, and a sloppy fit on a damp wall soon means a buzzing fan, a burnt switch or a tripping MCB every monsoon. Book through /#booking for a fixed estimate, or message SDR on WhatsApp with a photo of the space — most bathroom and kitchen exhaust jobs in the valley are completed the same day. Pairing the fan with new lighting? See /services/lighting-design or price LED work first at /blog/led-lighting-cost-nepal.

Exhaust fan installation cost FAQ

How much does bathroom exhaust fan installation cost in Kathmandu? Supply and basic fitting lands around Rs 4,000–7,000 for a standard 6-inch unit on an existing point. A brand-new point from the DB with ducting typically totals Rs 6,500–11,000 depending on wall type and how far the duct must run.

What does kitchen exhaust fan wiring cost in Nepal? A dedicated kitchen fan point with switch and MCB is Rs 2,200–3,500 in Kathmandu, plus Rs 5,000–12,000 for a ducted kitchen exhaust unit installed through the external wall.

Do I need an electrician just to replace an exhaust fan? If the hole, wiring and switch are all reused and you can safely isolate the circuit, no. If anything moves — new position, new size, new circuit, any work inside the distribution board — hire a licensed electrician so the job stays safe and insurable.

SDR Smart Design and Repair handles exhaust fan installation, sizing and moisture-safe wiring across Kathmandu Valley. Request your free quote at /#booking or call 9801508528 today.