I like to leave about 12" clearance at the top. The stationary panels can go all the way to the top and let the doors be shorter.

Thank you for the heads up on powder coating, Plllog! I just assumed the colours could be custom mixed to match but what you say makes sense. We recently had our driveway gates refinished and ran into some issues with limited colour choices because of the technical composition of the paint. The same issue might apply here. Also, a while back I was considering a custom coloured Blue Star oven and was surprised that, of the the 100 colours available, they don't offer a creamy off-white or even a warm super-light grey. Was told that colour is hard to create in the type of paint that is required for their application. Interesting! Anyhoo, I had a great phone call with the HVAC tech who has installed a few Lux's before but no follow up since. No reply to emails (photos and measurements he requested) or return phone call to book a visit. So no progress there. But I did find out that a model home about an hour from me has one installed and I hope to find a day to go check it out. Kaseki, thank you so much for all the excellent information. I have only just started to better understand ventilation and make up air and it's giving me a lot to think about, and frankly I'm getting scared off of this product as a result. I didn't realize that having too much ventilation could be a problem (other than noise). I had a very long phone call with a residential building code engineer at our municipality the other day (regarding putting the cooktop under the window, it's 100% safe and permitted in my case! yay!) as well as a great chat with a gas fireplace insert technician, both schooled me in ventilation physics and just how finely balanced a home *should* be in this regard. We have four wood burning fireplaces which all have gas starters, as well as some other gas appliances, and a large home with a weird layout. These factors, along with the height of the Lux over the cooktop, has made me realize this plan might need advanced degrees that I don't possess in order to feel confident about it. I'll keep you posted....

Well, it has some ceiling, some place. Is it the same ceiling as the master bedroom? Sloped and high? You could install a recessed can light or shallow surface light or track light far above. Or hang a pendant that comes no lower than about 10 feet above the shower floor (Check the building code. The approved height is usually given as 8' above the rim on the tub, but you don't have a tub, so...). All lights must be approved for damp locations. This is my favorite illustration of that part of the code... And, you could install a lower ceiling. Not difficult.

Explanation first: We've lived here 3 years; the house was built in the early 90s. The master bath shower is like a small closet, 5x5 with an 8' ceiling, and everything is tiled including the ceiling. There's a 30" wide glass door that, when closed, leaves a small gap below the lintel for airflow. The bathroom itself is large and has a ventilation fan. The register vent is above the shower ceiling, but the bathroom ceiling itself is more like 10'. This is a pretty dry climate but we have to leave the shower door open or it just stays damp in there. We are pretty sure the grout in the floor is damaged and it's leaking into the shower pan, so it's looking like we are going to have to re-do the whole shower. What can I do for ventilation in there that won't cost a zillion dollars?