When we talk about Honeywell 18155 Silentcomfort Permanent True Hepa Air Purifier we talk about air purifier that is made for rooms of up to 197 sq. feet. It is made to clean the air quickly and quietly. This is useful if the Honeywell 18155 air purifier is used while sleeping. It can also be used in nurseries, children’s rooms, offices and other spaces where noise is unwanted. This Honeywell 18155 air purifiers prefilter is a carbon prefilter. This device gets rid of odors and gases in the air. It also traps large particles before they can reach the HEPA filter.

This model also has two IntelliCheck indicators. One of these is for the permanent HEPA air purifier filter. This filter only needs to be clean sporadically as it will last as long as the purifier is working. This indicator will signal you when it is time for the filter to be cleaned with a vacuum. With normal use, this would only be twice every 12 months. The second IntelliCheck indicator is responsible for the carbon prefilter. The manufacturers advise getting a new one at least every 3 months. This will depend on how regularly the air purifier is being used. This indicator acts like the other one; it indicates when it is time to change the filter.
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