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How to choose duct booster fan with pressure switch?

2022-02-03 hqt
duct booster fan with pressure switch

The duct booster fan with pressure switch is the best-selling unit in the ventilation market. But how many buyers have chosen this product correctly for their premises? Are many fans running underpowered at the moment?

To buy the right unit for your bathroom or kitchen, all you have to do is ask one of the most important questions. How to choose a household fan for installation in a certain place? We will tell you all the tricks and rules so that you definitely do not lose.

When is a duct fan most often important?

Ventilation in a residential building or apartment

The main difference between forced ventilation and natural ventilation is that an duct fan comes in the duct opening to speed up the extraction of duct air from the room.

  To begin with, let's figure out where we most often encounter problems with polluted, waterlogged or smoky air. Most searched for duct booster fan with pressure switch:

  • duct fan for bathroom
  • duct fan for laundry room
  • toilet fan
  • extractor fan in the kitchen
  • silent fan for a living room where there is no high-quality air exchange.

If there is no such overflow, your expenses for the duct fan will be superfluous. There will still not be enough fresh air in the room, but the humidity will still go away.

duct booster fan with pressure switch 2022

 For any ventilation, it is necessary to have two channels - supply and duct. If the work of one of them disrupts, the air circulation will immediately stop.

Brief instructions for choosing duct booster fan with pressure switch

  • First, we measure the diameter of the connection (ventilation duct in the room).
  • determine the performance of the device, suitable for your premises (we make calculations)
  • We measure the diameter of the connection (vent. duct in the room)
  • We choose the functionality for the convenience and requirements of the room
  • decide on the brand, and choose the model that suits the requirements and design
  • Installation work (not a difficult process, so you can implement it yourself).

Variety of duct booster fan with pressure switch

  Fans for domestic use distinguish by:

Connecting diameter to the air duct, air duct or riser: from 75 to 150 mm. The larger the connection diameter, the more powerful the fan;

Air flow or productivity in m 3 per hour: the larger the room, the longer the duct, the higher the ventilation riser, the greater the pressure the fan should provide;

How to choose a duct booster fan with pressure switch?

Duct booster fan with pressure switch provides protection against the return of duct air back, or getting into the vent. The pollution channel is the main attribute for the toilet and kitchen. By the way, in our Blog there is an article about the need for a check valve - be sure to read it;

Fan speed control method: two-speed, with step or smooth electronic control by an external unit;

Operating mode: for continuous operation or periodic switching on;

Installation method: recessed into a wall or ceiling or surface mounted, with discharge into a duct or through an air duct to the street.

  The variety of models and designs is amazing. It is easy to get lost in it. But we will tell you where to start, and how to choose a fan for a particular application, so as not to be mistaken.

How to calculate fan performance?

  Let's start with the fact that the task of a duct booster fan with pressure switch for a room of a certain volume is the effective removal of polluted air with a standard multiplicity, i.e. per unit of time, the entire volume of air must be updated several times. This total volume determines the air flow in m 3 / h - the main characteristic of the fan.

How to choose a fan in the bathroom?

Calculation and selection of a fan for a bathroom in such a room, it is important to consider the need to remove both moisture and polluted air. Therefore, when considering options for a bathroom, it is important to use the correct formulas for calculating power.

  It would also be nice to include a timer or turn-off delay timer in duct booster fan with pressure switch. Having provided such options, the fan will turn on as soon as the humidity exceeds the norm, and turn off 25 minutes after you leave (delay timer), or it will work according to the time you specified (timer).

 A priori protection must come into the model. Otherwise the fan will not work even for a year, like any other equipment in contact with water. Therefore, you should look at the protection factor in the technical specifications - it should be IP 44 and higher.

How to check duct booster fan with pressure switch?

  It is also important to provide for the presence of a check valve or shutters that block the air duct channel after the fan is turned off. This will eliminate the threat of odors and moisture from neighboring apartments, as well as reduce heat loss in the apartment's rooms.

Ventilation in the dressing room - the nuances

  The whole point of the dressing room is that people only come here a few times a day. You use the most persistent and odorous conditioners when washing, clothes will still smell bad. And let's not mention the accumulation of dust and things, or bacteria after unwashed hands - this is already known. Therefore, a fan is needed in the dressing room.

  When choosing duct booster fan with pressure switch, we look at 3 parameters:

  1. fan type
  2. performance
  3. timer


Due to the fact that the room is different from the bathroom and kitchen, the air in it is not dense and not polluted. Here you need to choose a fan that is not very productive, so that you are not cold to change clothes, but not weak either, because the room usually has an area slightly larger than the bathroom.

  Device type

 Most often, an axial or centrifugal type of domestic fan comes for the dressing room - they show very high results and have good efficiency, but you can also choose the usual duct type.

  The timer is needed so that the fan turns off without your intervention after you leave, in order to ventilate all the remaining carbon dioxide and other things. You can set the parameter to turn it off after 30 minutes - this will be enough for the desired effect.