Our Power Apex garden sheds have a small ventilation gap at the top of the apex under the roof overhang for ventilation. The roof overhang protects the shed from water ingress but innovatively allows condensation to escape.
Our Power Pent garden sheds can be ventilated under the roof overhang on the low side. However, you would need to ensure you do not install the low side soffit on the underside of the roof if you do want ventilation. We supply the low side soffit as some customers want the gap covering, but either way is fine.