About this 3D model

8 Vents for sci-fi wargamming sceneries in 28/32mm. To glue on walls Different size and shape of vents : round 32mm round 24mm rectangular 30x16mm rectangular 20x10mm rectangular half 20x10mm rectangular half 20x7mm rectangular half 16x7mm big 50x28x33mm No support required half : meant to be on the floor or over something else