If there are no holes on the bottom, how can fresh air come in.
Holes on bottom can not enter rain if you insert it in smoker.
The air inlet must be some distance from ground.
If necessary you can raise your smoker a little from ground
the SS box is not big enough, but it works.
I can send you a corrugated SS pipe free, but you need to pay shipping cost.
You can buy plastic box locally.