Putting Lintel into supporting wall help Appreciated Please!

[leighsmith]

ideas what else is possible when it comes to ventilating confined areas

Could you put a brushless, thermostatically controlled extractor fan behind the false wall venting outside? Silent SR100 claims to be very quiet. You might add an external air inlet beneath the electrical items if you don't want to leave gaps around them.

Thats seem like a fair solution brushless should be quieter or what about just a 3" vent to the outside wall at least the hot air shouldt build up.

Would this be acceptable amount to go into the cavity as it would be deemed a small diameter hole?

yes i have a look at what these extractor retail at cheers!