Building a Custom Steel Fireplace - Looking for Feedback!

[SolidBurn]

Hi everyone,

I'm working on a custom outdoor fireplace installation for a patio area in a Central Florida home and have a few design and performance questions. I've attached a few drawings detailing my current fireplace design concept. I'd really appreciate any thoughts and advice.

Here are a few things I'd really appreciate your advice on:

1. The fireplace is fairly wide (approximately 50 inches) but relatively short (around 16 inches). Does anyone have experience with draft or combustion issues in similar outdoor setups?
2. My chimney height is around 16'-4" tall, extending approximately 8 feet above the roofline. Given this is an open-sided covered patio with likely cross-breezes, is this height likely to provide sufficient draft, or would you suggest increasing it?
3. I'm considering using an air chamber fan to help improve the draft. Has anyone successfully incorporated fans within the fireplace air chambers for an outdoor application, or is a chimney-top fan typically more effective?
4. Can anyone recommend a qualified fireplace or masonry engineer who I could consult with on finalizing this design?

This design is primarily based on the insulating steel units they commonly sell in Aus and NZ, such as this model: Jetmaster 1200

Thanks very much in advance for your thoughts and recommendations.

 

[begreen]

The low profile looks more like for gas. However, it should work fine as long as the manuafacturer's requirements are met. I would use the matching sized class A stainless chimney pipe instead of the custom fabrication. It can be bought in black if that is preferred.

Getting a US made system can help with chimney fitment so there is no metric conversion/adaptation needed .

https://www.majesticproducts.com/fireplaces/outdoor/villawood-wood-fireplace

https://www.efireplacestore.com/outdoor-fireplaces.html

 

[SolidBurn]

Hey, thank you for your comments. I have explored prefabs as an option, but they don't quite achieve the look I'm going for, and their service department doesn't really want to approve using their units for this design for some reason. Those chimneys are a good option, but I'd have to support them with a tie down to the roof which I'd like to avoid.
Also for clarification, I'm not looking to buy that Jetmaster model, it's only a basis for the design of a firebox that I would have custom welded out of 1/4 and 3/8" steel. Building code here allows for custom made steel inserts for outdoor units, but there are some grey areas as to the design of the firebox.
Anything in the design of the firebox stand out as incorrect, or needing modification?
Also for reference, here is a similar design from the architects in NZ who designed the unit.

 

[begreen]

There are alternatives for chimney support but it doesn't look like a roof support will be needed. The chimney doesn't need to be that tall for an open fireplace. This will become more clear as the plan gets refined. If the fireplace is custom made, try to size the flue area to be at least 1/10th the fireplace opening area. So if it's 800 sq in. then a 10" flue would work.