Envirovent Silent Timer Humidistat Extractor Fan 4" SIL100S SIL100T SIL100HT
The Envirovent SIL125T is the Strong and Silent type of the fan world. The Envirovent SIL150T is the Strong and Silent type of the fan world. SIL150 Envirovent Silent elastic mounting blocks. SIL150 Envirovent Very Quiet - 33db(A).