How to ventilate a sealed garage conversion/cinema room

[Rolph]

Hi all,

I need to find a solution to ventilate a project I am working on.

I have an external, standalone, single skin brick garage with pitched slate tiled roof. I am in the process of converting it into a cinema room.
It now has no windows and one single UPVC door to the garden.

I have put in damproofing, with 75mm insulation board in the floor, all internal walls have had stud work fitted that will have 75mm insulation board in. I have left a small cavity between this and the external brickwork.

Above the ceiling will be loft insulation. I am having air-con fitted for heating/cooling, this will not introduce fresh air or expel stale moist air, and this is my problem, how best to get fresh air in and expel farty moist air?

I have been looking at dMVHR units, bathroom extractors, air bricks ducted through the cavity, loft mounted PIV units, the options are many.

Obviously being a cinema room I would like no light ingress and minimal noise.

Essentially it will be a sealed box, so a PIV unit would not be able to force out stale air. I have thought about a PIV unit, couple with two air bricks int eh gable walls to allow fresh air flow in the loft, with a vent in the ceiling of the room to allow the positive pressure to push out the stale air.

Any thoughts or suggestions greatly appreciated as I'm now at the stage of fitting the wall insulation so need to have a plan in place.

Thanks!

 

[Wayners]

Fan blowing out with small vents letting air in.
The problem you have was covered recently on the skillbuilder YouTube channel. The fact we are making buildings air tight trapping moisture leading to high humidity.
Maybe a humidistat extractor fan on a run of solid pipe with a coupe of outlets to extract air..

 

[Harry Bloomfield]

Obviously being a cinema room I would like no light ingress and minimal noise.

No light, would involve matt black paint in the air duct, and the duct would need to have a dog-leg in it, to block the direct path for the light.

 

[Rolph]

Fan blowing out with small vents letting air in.
The problem you have was covered recently on the skillbuilder YouTube channel. The fact we are making buildings air tight trapping moisture leading to high humidity.
Maybe a humidistat extractor fan on a run of solid pipe with a coupe of outlets to extract air..

I do watch their videos, they're informative.
I believe I have seen the one you are talking about.
An extractor is an option, I can get them in black, but not sure how much they would go to solve the lack of fresh air.

 

[Rolph]

No light, would involve matt black paint in the air duct, and the duct would need to have a dog-leg in it, to block the direct path for the light.

Yes some sort of painted baffle box could be an idea.