Room area (humidification)
A very conditional parameter that slightly characterizes the purpose based on the size of the room. And depending on the height of the ceilings, layout, building design and equipment, actual values may differ significantly. However, this item represents the maximum recommended room area for which the device is designed. In fact, this paragraph indicates the maximum service area in air humidification mode: use on a smaller area is quite acceptable, but the device simply does not have enough performance for a larger space. We also note that the area is indicated based on a standard ceiling height of 2.5 - 3 m. With higher ceiling heights, the effective humidification space decreases; it can be recalculated using special formulas.
When choosing by area, it is worth taking a certain reserve, but it should not be too large - otherwise the device will turn out to be overly powerful, bulky and expensive.
Water tank volume
The volume of the water tank installed in the humidifier. Large capacity allows you to work longer without refuelling but affects the dimensions and weight of the device. Therefore, manufacturers choose the volume based on a compromise between these points and taking into account water consumption. Usually, the volume of the tank is chosen in such a way that the humidifier can work quietly on a single refill for at least 2-3 hours, and often even more. Accordingly, the more capacious the tank, the more powerful and performant the device, as a rule. So, models with a volume
of up to 2 litres belong to the entry-level,
from 2 to 4 litres — to the average,
from 4 to 6 litres — to the larger than average category, and in the most capacious devices this figure can
exceed 6 litres .
Note that for models with the possibility of using a bottle (see below), this paragraph often indicates the optimal capacity of the bottle (such devices may not have their tanks).
Maximum noise level
The noise level generated by the air purifier during operation. Most of these devices are used in residential areas, so this parameter should be treated carefully. According to sanitary standards, constant noise in such rooms should not exceed 40 dB (quiet conversation) during the day and 30 dB (wall clock ticking) at night. More detailed comparison tables and recommendations can be found in special sources. It is also worth mentioning that the noise level is indicated for the maximum operating speed, so the noise level will be significantly lower in reduced mode.
Power consumption
It is the maximum power consumed by the device during operation. The lower it is the more economical the device. However, it is worth noting that in humidifiers, energy consumption is directly related to the principle of operation (see "Humidiation"): with similar characteristics, steam models are high consumption, where energy is spent on heating water, and the most economical are water models. Nevertheless, the energy consumption of modern humidifiers is generally low — even for steam humidifiers it rarely exceeds 600 W, and ultrasonic devices with similar power are already heavy industrial equipment. Purifiers also do not differ in consumption: a power of more than 100 W is rare among such devices.
