Last updated: September 7, 2026
Every exhaust fan type BAER manufactures, how to size one, and how to choose the right model for your application.
An exhaust fan removes stale, humid or contaminated air from a room and discharges it outside. It is the simplest and most cost-effective way to control moisture, odour, heat and indoor air quality — and it is also the most commonly mis-specified piece of ventilation equipment. This guide covers every exhaust fan type BAER manufactures, how to choose the right one, and how to size it correctly.
Every exhaust fan is a simple machine: an electric motor spins an impeller that creates a pressure difference, pulling air from the room and pushing it out through a duct or grille. The room then draws in replacement air through gaps, windows or a dedicated intake, creating continuous ventilation. The difference between fan types comes down to where the impeller sits (in the ceiling, wall, window or duct) and how it handles resistance (static pressure). A fan that moves plenty of air in free air can still fail if it cannot push against a long duct — which is exactly why BAER offers both low-pressure window fans and high-pressure mixed-flow duct fans in one catalogue.
Exhaust fans are usually grouped by where they mount and how they move air:
| Type | Mounting | Best for |
|---|---|---|
| Ceiling exhaust fan | Ceiling, ducted to outside | Bathrooms, kitchens, offices |
| Wall / window exhaust fan | Through a wall or window opening | Kitchens, workshops, warehouses |
| Window exhaust fan | In a window frame | Rooms without duct space |
| Inline duct fan | Inside the duct run | Long ducted runs, hidden installs |
| Silent bathroom fan | Ceiling or wall | Bedrooms, noise-sensitive spaces |
| Silent cabinet fan | Enclosed / cabinet | Commercial, plant rooms |
Most buyers start with ceiling or wall fans because they are the cheapest to install, then move to inline or silent models when noise or ducting becomes a factor. If you are unsure which mounting suits your building, our ceiling vs window guide and wall vs ceiling comparison break it down room by room.
Four factors decide which fan fits. Get these right and the fan will perform; get any of them wrong and even a good fan will disappoint.
Size the fan to the room's volume and the required air changes per hour (ACH), not to floor area. Use our CFM calculator to get the number, then add a 10–20% margin for duct resistance.
Ducts, bends and grilles create resistance. A wall axial fan collapses under it; an inline mixed-flow fan holds its airflow. If ducting is involved, choose for pressure, not just airflow.
For bedrooms and living spaces, choose a low-noise model and match the duct diameter to the fan. See our exhaust fan noise levels guide for what to expect.
Match the motor to the destination grid: 110V/60Hz for North America, 220–240V/50Hz for Europe and most of the Gulf, and 220V/60Hz for Saudi Arabia.
Under-sizing is the #1 cause of "my fan doesn't work" complaints. Size to volume and air changes per hour (ACH), never to floor area. A room with a 2.5 m ceiling holds twice the air of one with a 1.25 m ceiling at the same footprint — and you have to move all of it. Use the formula below or the CFM calculator.
Worked example: A 4 m × 3 m × 2.5 m bathroom = 30 m³. At 8 ACH (typical for bathrooms) that is 240 m³/h, or about 141 CFM. Add 15% for duct and grille resistance and you need a fan rated around 275 m³/h (160 CFM). BAER's 6-inch models deliver 984 CFM at free air and hold strong airflow under pressure, leaving comfortable headroom for real installs. For a step-by-step walkthrough with more room types, see our airflow calculation guide.
Static pressure is the resistance the fan must overcome, measured in Pascals (Pa). Every metre of duct, every bend, every grille and every filter adds Pa. A window axial fan may be rated at near-zero Pa; a mixed-flow inline fan is built to hold its airflow at 20–50 Pa and beyond. If your installation has any ducting, choose for pressure, not just free-air CFM — the number on the box is measured with no duct attached, so real-world airflow is always lower. Budget a 10–20% margin and you will not be disappointed.
Exhaust fan motors come in three flavours. AC motors are the workhorse — cheap, robust and available at every voltage we stock. EC (electronically commutated) motors integrate the controller into the motor, run cooler, modulate speed efficiently and cut energy use by 30–60% at part load — ideal for 24/7 commercial extraction. DC motors dominate in low-voltage and battery-backup scenarios. For duct fans specifically, our EC vs AC motor guide explains the payback maths. BAER offers AC as standard and EC on request for OEM and large projects.
A "standard" exhaust fan mounts on a wall, window or ceiling and pushes air straight out. An inline duct fan sits inside the duct and is the right call when the air has to travel. Rule of thumb: if the outside is directly behind the fan, a wall or window fan is simplest and cheapest; if you need to route extraction through a ceiling void, across a room or to a distant grille, choose inline. The two are complementary, not competing — many villas use a window fan in the kitchen and inline fans in the bathrooms.
BAER manufactures six exhaust fan series, all factory-direct with CE certification and a 2-year warranty:
| Series | Typical application |
|---|---|
| KLT panel exhaust fan (7 sizes) | Bathrooms, kitchens, workshops, warehouses |
| 6-inch high-airflow fan | Workshops, commercial kitchens, light industry |
| Inline mixed-flow duct fan | Centralised extraction, villas, hotels |
| Silent bathroom fan | Premium residential and hospitality |
| Window exhaust fan | Volume residential line |
| Ceiling-mount fan | Bathrooms, kitchens, offices |
| Silent cabinet fan | Large commercial spaces, plant rooms |
The KLT series is BAER's square-panel wall exhaust fan family: seven models from the 6-inch KLT-10B (150 m³/h) to the 18-inch KLT-30B (1,800 m³/h). Every model shares an integrated gravity auto-shutter, a 220 V / 50 Hz platform and the same wall cut-out method, so a whole project — bathrooms, kitchens, workshops, warehouses — can be specified from one supplier with one spare-parts list. See the full KLT series specifications and sizing guide →
Saudi Arabia, the UAE, Iraq, Kuwait, Qatar, Oman and Yemen share extreme heat, fine dust and high coastal humidity — all of which punish under-specified fans. BAER builds for these conditions: 220V/60Hz and 220–240V/50Hz motors, sealed bearings that resist dust ingress, and corrosion-resistant coatings for coastal sites. For villas and hotels we recommend mixed-flow inline fans for quiet centralised extraction; for workshops and warehouses, high-volume wall or axial fans. See country-specific guidance for Saudi Arabia, the UAE, Iraq, Kuwait, Qatar, Oman and Yemen, or start with our Middle East overview and the climate guide.
Every BAER exhaust fan is CE certified, with CB, SAA and ETL available for specific markets. See the certifications guide to understand which certification your destination market requires.
Calculate the room volume (length × width × height) and multiply by the required air changes per hour, then divide by 60 to get CFM. Bathrooms need about 8 ACH, kitchens 15–20 ACH. Use the CFM calculator for an instant result, and add 10–20% for duct resistance.
A ceiling fan mounts in the ceiling and ducts to the outside; a wall fan mounts through a wall opening. Ceiling fans suit bathrooms and offices; wall fans suit kitchens and workshops where a direct wall path exists.
Yes. We supply genuine 220V/60Hz motors for Saudi Arabia and 110V/60Hz for North America, in addition to 220–240V/50Hz for Europe and the wider Gulf.
MOQ is 100 pcs per model for stock models and 500 pcs for OEM/private-label, with mixed models accepted in one container. See the MOQ guide for full details.
Send your application, room size, voltage and quantity — our engineers reply with a recommendation and factory-direct quote within one working day.
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