Hi Anet

It seems extremely unlikely that this hearing booth would be a "confined space" within the meaning of the term set out in the Confined Spaces Regulations.

....unless it is of very odd design and/or installation.

So, I suggest that you look at the definition in the Regulations and work out why you can discount each of the reasons why the booth would come within scope.

If, by any chance it DOES fall within scope, probably time to go back to the drawing board.

It may be a little bit late after installation to be conducting a risk assessment.

Back at the outset of hearing conservation my employer purchased a test deck and booth from Bilsom (other suppliers are available).

Location is important not only to avoid unwanted noise transmission affecting the results but also with respect to ambient conditions - you will be surprised how quickly the inside can warm if the booth is in direct sunlight.

Our unit came with a fan to effect air changes and even without the design itself was not airtight so the risk of asphxyiation is negligble.

The most horrendous aspect was the perforated panel on the back of the access door - the spacing pattern often sending test subjects scurrying for a bucket until a poster was placed in line of sight.

The other "fail" on our first installation was in positiong the unit such that the office door opened in to the path of the booth door effectivley locking the test subject inside