Covered top vent for Betamid

I have pondered the same question. Here's what I intended to do on my Twin Peaks but never did: use an aluminum or carbon pole, maybe around 24" long or so. Sew a sleeve to the ridgeline (on the exterior) starting at the front peak and running back along the ridge about half the length of the pole. So half the pole is in the sleeve, half extends out over the door. Then you add fabric triangles , one each side, from the pole down to the seams where the sides of the shelter meet the front. You'd have to play with these to get the tension right, but I think it would work well. It's possible that instead of sewing the pole sleeve right to the ridge that you'd want a gusset between the pole and the ridge – that depends on the flexibility of the pole and the angel you want to achieve with the extended portion.

maybe top vent doesn't have enough cross section area. Need something like an entire door to provide good ventilation.

Well, I contacted Rainy Pass in Seattle (gear repair and modification specialists) and asked about the cost of installing a hooded peak vent and a 10" net skirt sewn into the bottom hem of the betamid. They said they could definitely do the job, but that it would run me $75/hr with the job taking approximately 3 hours. Their advice: buy a new tent. I agree — though I may take a run at the netting skirt myself and see if I can just pitch in ways that create the desired airflow. Anyway, thought folks might be interested in what I learned….