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Old 9th August 2019
Lives for gear
Jason Foi's Avatar

Originally Posted by Jcoop View Post
Back to the hatch!

I found some hardcore acoustically sealed hatches - designed for studio use - but they're likely expensive and I think overkill for my application ( I don't intend on opening the access door. Ever, really. It's just a matter of having access to the gas shut-off valve in an emergency.

So, I came across an ABS drain cleanout fitting. It's 4" (small hole but big enough to squeeze my hand through), it's deep (I can pack it with material to bring the cavity back up to some kind of isolating "par"), and it's airtight.
If you can get the mass right, the cleanout would work. I would think a diy door would be easy and cheap, but whatever youre comfortable with.