Please help with acoustic baffle box...
Posted: Sat Nov 30, 2019 3:27 am
This is somewhat stressing me out, getting my head around the exact specifics of what's required here, as I'm aware how important it is.
I am trying to determine the exact sizing my baffle box should be for air exchange in a small garage conversion. This is NOT hooked up to an HVAC system, it's simply to adhere to the UK regulations for ventilation, which stipulate that there must be four air changes per hour, plus I obviously need to ensure I get air in/out of the room or I'll suffocate lol!
My room is 23 cubic meters. Dimensions are: 2.5m wide, 4m long and 2.3m high. It is stud walls, decoupled from the surrounding brickwork, with a double wall at the end. All walls + ceiling will have double layer pb with green glue. These two end walls are not connected in any way, with a 2-3" gap between them.
I have somewhat of a learning disability when it comes to numbers/mathematics, so some of the equations I've seen are rather complex for me to get my head around.
I do understand the following however...
- The cross section of air flow inside the box should be twice the cross section of the inlet and outlet duct
- I need suitable duct liner for the inside of the box (I have identified this one as being suitable - https://www.advancedacoustics-uk.com/St ... Foam-Panel
Things I am unclear on...
- The exact size my boxes should be
- If I should have one box on the inner-leaf and another one on the outer leaf, i.e 4 boxes, or if 2 will suffice. My main concern is noise leaking out of the room (it will be a home cinema)
- The orientation of the box on the walls, and if this matters?
- I plan on utilising an in-line fan on one or both boxes... my preference is to have one as intake (for positive pressure), but should I have one extracting also?
- What speed should the fan be? I have identified a variable speed one which I think is suitable, but I am not clear how to determine this - https://www.hg-hydroponics.co.uk/phresh ... 6729-p.asp
- I do plan to connect a filter to the fan also, which I'm assuming is OK?
Would very much appreciate any advice. Many thanks.
I am trying to determine the exact sizing my baffle box should be for air exchange in a small garage conversion. This is NOT hooked up to an HVAC system, it's simply to adhere to the UK regulations for ventilation, which stipulate that there must be four air changes per hour, plus I obviously need to ensure I get air in/out of the room or I'll suffocate lol!
My room is 23 cubic meters. Dimensions are: 2.5m wide, 4m long and 2.3m high. It is stud walls, decoupled from the surrounding brickwork, with a double wall at the end. All walls + ceiling will have double layer pb with green glue. These two end walls are not connected in any way, with a 2-3" gap between them.
I have somewhat of a learning disability when it comes to numbers/mathematics, so some of the equations I've seen are rather complex for me to get my head around.
I do understand the following however...
- The cross section of air flow inside the box should be twice the cross section of the inlet and outlet duct
- I need suitable duct liner for the inside of the box (I have identified this one as being suitable - https://www.advancedacoustics-uk.com/St ... Foam-Panel
Things I am unclear on...
- The exact size my boxes should be
- If I should have one box on the inner-leaf and another one on the outer leaf, i.e 4 boxes, or if 2 will suffice. My main concern is noise leaking out of the room (it will be a home cinema)
- The orientation of the box on the walls, and if this matters?
- I plan on utilising an in-line fan on one or both boxes... my preference is to have one as intake (for positive pressure), but should I have one extracting also?
- What speed should the fan be? I have identified a variable speed one which I think is suitable, but I am not clear how to determine this - https://www.hg-hydroponics.co.uk/phresh ... 6729-p.asp
- I do plan to connect a filter to the fan also, which I'm assuming is OK?
Would very much appreciate any advice. Many thanks.