gudkarma
New Member
i wish i could edit the error in my thread title 
in this case, however, a picture is worth a 1000 words.
having tried a fan speed control & getting poor results regarding noise at my fresh air intake, i came up with this solution on the fly.
as you can see the "duct muffler" is super simple yet, and i assure you having tested it completely, works bomb diggity.
in the pic, you can see the 4.25" fresh air intake at my roof peak with flexible duct going to the top corner of an 18 gallon tote. what you dont see is another 4.25" collar at the bottom (opposite end from intake) of the tote & about 8' of flexible duct which continues the fresh air intake to my grow room.
you also dont see the 200 cfm fan that does all the work.
nevertheless, we have a simple box (acting like a plenum) with an in & out.
no insulation. no padding. nothing inside.
i cut the necessary holes with a 4.25" hole saw, installed starter collars (found in duct work section of home store), and carefully foil taped both sides of each collar.
with some creative foil tape skills, one could easily make a filter rig on the inside of the tote & accessable via the lid to accept a furnace filter over the intake or exhaust collar.
this simple tote set up cuts down on the "wooshing" noise of air being pulled into my intake 100% .
you hear nothing (zero, zip, nada) at full bore fan speed on the outside of my garage.
in this case, however, a picture is worth a 1000 words.
having tried a fan speed control & getting poor results regarding noise at my fresh air intake, i came up with this solution on the fly.
as you can see the "duct muffler" is super simple yet, and i assure you having tested it completely, works bomb diggity.
in the pic, you can see the 4.25" fresh air intake at my roof peak with flexible duct going to the top corner of an 18 gallon tote. what you dont see is another 4.25" collar at the bottom (opposite end from intake) of the tote & about 8' of flexible duct which continues the fresh air intake to my grow room.
you also dont see the 200 cfm fan that does all the work.
nevertheless, we have a simple box (acting like a plenum) with an in & out.
no insulation. no padding. nothing inside.
i cut the necessary holes with a 4.25" hole saw, installed starter collars (found in duct work section of home store), and carefully foil taped both sides of each collar.
with some creative foil tape skills, one could easily make a filter rig on the inside of the tote & accessable via the lid to accept a furnace filter over the intake or exhaust collar.
this simple tote set up cuts down on the "wooshing" noise of air being pulled into my intake 100% .
you hear nothing (zero, zip, nada) at full bore fan speed on the outside of my garage.
