replying to Lacustral, Just_tryin_2_help wrote:
Some fans are louder than others. Call a hydroponics store for the best info.
They sell a LOT of inline fans and people want the quietest possible in that
case. You won't need a tremendously hight CFM as you know. With the fan
located in the attic the motor noise will be a non issue, as long as you have
some decent attic insulation AND make sure to put rubber washers between the
fan mount and the house frame to keep vibration noise down. The other main
issue with fan noise is the inlet hole size (the sound of moving air). The
bigger the hole size, the quieter the noise. You can start with 6" ducting and
then put an 8" or 10" expander on the end that opens into the kitchen. This
will greatly reduce sound and not deplete efficiency. Another nice thing about
the hydroponic stores is they will usually open the fan box and plug it in
there in the store so you can hear the noise level. Very kind indeed.

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