Thanks, there is no sticker, is there any other way of knowing? In terms of returning it I have contracted the seller to see what he says, also will be influenced by an overnight run.
Rich
Correction, have checked again and the main sticker over the exhaust fan says S3. Bit too obvious for me.
Yes
on the main sticker it says S3, S3+, or S3++. So you can tell all of this at a glance
Makes it easier them having to run them to see.