Missing or opened covers should be called out as should covers made from flammable materials such as thin plywood.
Attic hatch material in garage.
I wouldn t worry about a attic hatch in a garage if its not heated.
Having a ceiling in a garage imho creates a small space which means concentrated amounts of carbon monoxide.
In garages that have access to the attic a hatch cover made from an approved fire rated material should protect this access at all times.
Just because you have your garage door open doesnt mean the exhaust will automatically leave the space.
Exspecially in winter when the exhaust is visible.
Missing or opened covers should be called out as should covers made from flammable materials such as thin plywood.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.