COMBUSTION AIR

Problem

1.

I have a 200,000 Btuh furnace located in a confined space and would like to use the adjoining space to obtain inside building air for combustion. What are your requirements and show me any size requirements!

2.

I have a 200,000 Btuh furnace located in a confined space and would like to use the crawl space to obtain air for combustion. What are your requirements and show me any size requirements!