Home » 5 Best Ways to Choose a Grow Room Fans in 2021

5 Best Ways to Choose a Grow Room Fans in 2021

2021-10-18 hqt

Introduction of Grow Room Fan

Not everyone understands how important it is to maintain the correct microclimate at home; therefore they forget or ignore the installation of Grow Room Fan. This is a serious mistake - good ventilation ensures a normal flow of fresh air and the removal of waste or contaminated air masses.

In addition, the installation of forced exhaust ventilation allows you not to depend on the weather and control the ventilation modes of the room at your discretion. But excessive-performance will lead to the fact that the room will be cold and drafts will appear. Therefore, let's take a closer look at how to choose an exhaust fan.
Grow Room


Exhaust ventilation is recommended to be installed in those rooms where there is no natural airflow, as well as where the air is too polluted or there is excessive humidity. Such premises include a bathroom, a bath or shower, a kitchen, and a wardrobe. But you need to know how to choose a fan for exhaust ventilation so that it works with maximum efficiency.


Important points of Power calculation

When calculating how much power the Grow Room Fan should be, there are several important points to know:


It is measured in m3 / h and shows how much air the fan can remove in 1 hour.

Air exchange rate.

This parameter is determined by the type of room where ventilation is installed and shows how many times the air must be completely renewed. The more polluted the air in the room, the higher the ratio.

The volume of the room. It is calculated by the formula V = S * h, where V is the volume, S is the area of ​​the room, and the height of the ceiling.

The length of the ventilation ducts and the number of bends in them. The more complex the ventilation design, the greater the power reserve should be taken into account when calculating.

Each room has its multiplicity. 

  • Room type Multiplicity
  • Non-residential premises 1
  • Wardrobe 1.5
  • Living room 3
  • Kitchen 6-8
  • Shower / bath 7-9
  • Bathroom 8-10

To know how to calculate a Grow Room Fan for different rooms, you should use the following formula

  • Here L is the capacity, measured in m3 / h;
  • S is the area of ​​the room, m2;
  • h is the height of the room, m;
  • K is the multiplicity factor.

Example: Let's consider how to choose an exhaust fan using a specific example. We have a toilet with an area of ​​3 m2 and a ceiling height of 2.8 m. The air exchange rate for a bathroom is from 8 to 10, so let's take an average value of 9.

The capacity will be: 3 * 2.8 * 9 = 75.6 m3 / h.

If the exhaust duct is short, its influence can be ignored. But in an apartment building, it is recommended to add another 10-15% to the nominal performance. As a result, our bathroom requires an exhaust fan of 85-90 m3 / h. If you want to calculate the required air exchange in any room, you can use our online calculator.

Diameter selection

There are several standard Grow Room Fan diameters: 80, 100, 120, 125, and 150 mm. It is necessary to choose such a diameter so that it coincides with the diameter of the ventilation shaft and is installed there tightly. This will eliminate vibration during operation. Also, the diameter affects where the exhaust fan is installed.
Grow Room 2021

Choosing the right size of the exhaust fan

You can measure the diameter yourself using a tape measure. It is necessary to measure the hole where the fan branch pipe will be installed. Please note that if you have a square, rectangular or irregular hole, you must also measure the extreme points of the hole.

This is done to know exactly which bezel the fan should have. A properly fitted fan faceplate will completely cover the ventilation shaft after installation. It is not uncommon when customers do not provide for this fact and have to carry a replacement Grow Room Fan.

Check valve of Grow Room Fans

The non-return valve allows to partially prevents the ingress of outside air into the ventilation system. It cannot completely solve the problem of odors from neighbors in apartment buildings, but it will protect from insects entering the apartment through ventilation, dust, or dirt. Exhaust fans with a non-return valve are very popular in the market today.

Noise level of Grow Room Fan

The more efficient the hood, the more noise it produces during operation. But most manufacturers produce low-noise fan models with a noise level of 25-30 dB. The noise level is always indicated in the characteristics of the model - pay attention to this. The main thing is that this figure does not exceed 35 dB.

The mounting method of Grow Room Fan

There are two main ways to install a Grow Room Fan: overhead or directly into the ventilation duct. Duct-type fans are installed only in the ventilation shaft, the rest are mounted at the outlet of the ventilation channel. Some models are designed for wall mounting, others are mounted on ventilation ducts installed in the ceiling

How to choose grow room fan for bathroom?

Exhaust ventilation in the bathrooms of the rooms has increased requirements in terms of moisture protection since this equipment is constantly working in high humidity conditions. Considering how to choose an exhaust fan for a bathroom, pay attention to the following points.

Performance. To calculate, use the formula above. Do not forget that the air exchange rate for showers and bathrooms is from 7 to 9. If the shower room is combined with a toilet, it is better to focus on the air exchange rate of 8-10. A capacity of 100 m3 / h is sufficient for a standard bathroom.

Which fan is best for small rooms?

For a small room, an axial or duct (if it is possible to install directly into the shaft) Grow Room Fan is suitable. For apartment buildings with long canals or for rooms larger than 8 m2, it is better to choose a centrifugal fan. It is more expensive, but it shows higher efficiency.

Since the bathrooms belong to the category of premises with high humidity, the fan must have moisture protection. The manufacturer always indicates whether the equipment has such protection. To prevent premature equipment failure, the electrical protection class must be at least IP 44.


If the exhaust duct opening is near a water source and direct splashing is possible, it is recommended to choose IP 45 or IP 55 equipment.