banner over an oven? hot question!

I would pull the spec sheet for the material you are considering and see what kind heat/flammability rating it has.

 

In my experience, all the heat from an oven is inside the oven. This is a non-issue.

 

It's hot around ovens and if it was a permanent sign I'd say use aluminum.
Not just for safety but also cleanliness, it's gets real dirty greasy around cooking.
But since it's temp I'd be Ok with a banner but I'd hang it a little higher

 

Sure it can be hot around ovens. It's also hot as balls outside, and I don't see any banners melting or bursting in to flames. But go with what you feel I say.

 

One thing to consider........ if this is temporary, how do you intend to hang it and how will you patch the holes (or recommend to them) how to patch the holes when they're done with the banner ??

 

Drop ceiling so ceiling clips with wire or jack chain and I'd use pole pockets with a piece of pvc pipe top & bottom

 

Looks like a job tailor-made for removable wall vinyl (e.g. Briteline's Rad Grafix 6 mil removable and repositionable PVC wall graphic vinyl). As long as any heat from the oven that rises to the vinyl isn't over 200 degrees F, it's all good.

 

I think I would go with fathead type vinyl.

 

I agree. If it put out any kind of substantial heat, it wouldn't be on a counter close to the wall. If temporary, use 3m command hooks to hang or even colored thumbtacks it that's drywall.

 

You might consider selling them on aluminum by telling them you may be able to clean and reface the front side and if not apply a print to the back side and provide longer service of what your are selling them will knowing if they do, they will come back to pay you more.

Just my opinion. Let me know what happens, I like to see how projects wind up after people post asking for ideas.