Exhaust fan for the bathroom - why is it needed, features of different types, how to choose the right one?

The modern dwelling is so compact that airing and exhaust are simply necessary. Bedrooms, living rooms are often equipped with air conditioners and sinks, kitchens — with extractors. An exhaust fan for the bathroom will clean the air in the sanitary rooms in a timely manner.

Why do you need an exhaust fan in the bathroom?

Conditions of warmth and constant humidity are dangerous to health. In such an environment, fungi, mold and bacteria actively multiply. Unfortunately, the natural ventilation provided by builders often works very poorly. To keep your home safe, you need a bathroom fan. It will dry and freshen the air, remove unpleasant odors, protect furniture and accessories from damage, and make your stay in sanitary rooms comfortable.

why do you need a fan in the bathroom

Types of bathroom fans

All bathroom fans are divided according to two criteria: how they take in air and how high pressure is obtained in them to output the flow. There are such types of exhaust fans:

  1. Axial. Air is captured by the blades, high pressure is created due to the movement of the blades.
  2. Radial. Air is captured by the blades, high pressure is created due to the spiral shape.
  3. Centrifugal. Air is drawn in by a paddle drum, high pressure is created by the length of the channel.
  4. diametral. Air is drawn diagonally into a wide drum, high pressure is created by curved blades. A very rare species.

Axial fans

The most common among users is the axial unit. In a plastic cylindrical case, a fan is placed on the axis of the engine. Cantilever blades rotate, drawing in air, transfer it to the ventilation pipe. The flow moves only in the direction of the axis, there is no movement in the radial direction. These are the smallest silent bathroom exhaust fans. An air vent is used for installation. This option is only suitable for small rooms. It is productive in terms of air volume, but with low pressure.

axial fans

Radial fans

The radial exhaust fan for the bathroom is the most efficient of the existing ones. In the spiral housing there is a wheel with blades-vanes. During its operation, air moves radially, creating increased pressure, and is thrown into the outlet. Units come with one- and two-sided fence. Air ventilation with them is more efficient than with axial models. This is possible due to the increase in fan speed, and not due to its size. The shape of the wheel blades can be curved back / forward and straight. The disadvantage of such fans is vibration.

radial fans1

Centrifugal fans

Another popular fan is centrifugal (channel). This is a tube with a drum moving inside, on which the blades are located. The drum moves, the blades capture air due to the appearance of centrifugal force. Such fans are located at the end of a long channel (from 4 m). Duct ventilation in the bathroom is almost silent and can work without interruption. Installation is simple, done under the ceiling. Suitable for large rooms. The centrifugal fan and the channel after installation can be completely closed with plasterboard plates.

duct fans1

Roof fans

This option is installed directly on the roof, at the outlet of the ventilation duct. There are axial (air moves along the central axis) and centrifugal (air is drawn in due to the difference in pressure at the inlet and outlet) roof fans. The design includes:

ventilation duct; electric motor; vibration dampening device.
roof fans

How to choose an exhaust fan for the bathroom?

In order for the bathroom exhaust fan to serve well and for a long time, they proceed from the size of the room. The type of fan installed will depend on this. There are characteristics that should be clarified when buying.

  1. Air change rate. For a small room, it is a multiple of 6, for a large one — from 8.
  2. The noise of the unit itself. Some models are very noisy (from 30 dB), so it is better to use soundproof materials for their installation. It is better to choose a silent exhaust fan for the bathroom.
  3. The presence of a check valve to prevent air from being thrown from the duct is a necessary part of the fan. Such a valve will protect against the appearance of an unpleasant odor.
  4. The model should be directly for a room with high humidity, so that it does not deteriorate from moisture, there is splash protection.
  5. Many designs are equipped with additional devices: on and off timer, remote control, motion sensor. A fan with a humidity sensor for the bathroom (hygrostat) has proven itself well.


Bathroom Exhaust Fan Diameter

This parameter is important only for axial fans. The larger the diameter of the axis with the blades, the more air will be replaced by the unit. For radial, channel and diametrical types, the speed of rotation of the drum with blades is important. The bathroom fan is not placed independently, but in the air duct, so the diameter of the latter is important. Standard duct diameters: 105, 125, 160 mm. Large air ducts are used for industrial premises.

Rating of exhaust fans for the bathroom

When choosing fans for the bathroom, it is recommended to pay attention to the rating of the best models:

  1. SILENT-100 CZ. Axial fan from Soler and Palau. Device with one speed, lightweight, easy to install, heat and moisture resistant. Equipped with timer and humidistat. The advantage of this model is durability and economical power consumption. The disadvantage is the high price.
  2. SILENT-100 CZ

  3. Elicent-Style 100PR. The Italian axial fan from Elicent is easy to install and easy to operate, powerful. There is a non-return valve and splash protection. Minus — can make a lot of noise if installed incorrectly.
  4. Elicent-Style 100PR

  5. Mmotors mm-100. Exhaust fan in the toilet and bathroom from Mmotors JSC. Slim and light weight model. It can be installed in baths, steam rooms, because it can withstand high temperatures. Silent unit, easy to install, durable. The disadvantage is a small air exchange.
  6. Mmotors mm-100

  7. Cata CB-100 Plus. The CATA duct fan is suitable for a large room, as it is powerful. Low price, ease of installation, various mounting methods are the main advantages of the unit. Cons — not equipped with sensors, noisy.
  8. Cata CB-100 Plus

  9. Standard 5 D125. Low price, endurance, durability, ease of installation distinguishes this fan. The axial unit of the Russian company Era creates good air exchange. There are few drawbacks — the lack of a remote control and indication sensors.
  10. Era Standard 5 D125

  11. Maico ECA 100 iPro. The German hood manufactured by Maico is intelligent. It features high power, low power consumption, stylish design. Durable and high-quality fan, has a long warranty period, several speeds, indicators and sensors. The main disadvantage is the high price.
  12. Maico ECA 100 iPro

How to install an exhaust fan in the bathroom?

Installation of the device is done before they start repairs in the room. The hood in the bathroom is installed according to the instructions.

  1. Fit the fan to the air duct.
  2. Pull out the power cable from the switch and place it in the corrugated pipe.
  3. Install a mortgage in the exhaust duct (included in the kit or use a piece of PVC pipe of the required diameter).
  4. Lead the power cable outside the pipe so that the fan does not rub it.
  5. Fix the mortgage with mounting foam or cement.
  6. Install the fan in the mortgage hole and fix with dowels. There is an option for fastening with liquid nails or rubber bands, but such options are not reliable.
  7. Connect to mains. Exhaust fans for bathrooms and toilets have two connection options: simultaneously with lighting or separately.
  8. Install mosquito net and decorative grille.




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