If installing a water heater at 30,000 BTUs, a Unit heater at 30,000 BTUs and a furnace at 150, 000 BTUs?

Question

What requirements are there for combustion air?

Firstly by using air from inside the building and then for bringing air in from outside the building.

say gas fired

Answer 1

Check with your local city's building codes department. They are very specific about what is required for combustion air and for venting requirements.
When I installed my new gas fired furnace I had to increase the size of my combustion air inlet line.to the furnace room to meet new code requirements.

Answer 2

The water heater and unit heater are OK with internal combustion air but must be exhausted to atmosphere.
The furnace will need an external air supply to a forced draft fan and an atmopheric exhaust

Answer 3

The BTU definition given by utilising anybody above is nice. the purely difficulty i will imagine of with the Amish heater often is the quantity of warm temperature given off by utilising the human body that's more beneficial or less 500 BTU's in preserving with hour. possibly they were bearing on a set of Amish in a room or a spin the quantity of body warmth indirectly??? After a touch more beneficial analyze, I see those are genuine warmers which have a mantle on it that's made by utilising the Amish. The heater is otherwise a popular electric powered heater.

Answer 4

Would need to know the flue arrangements and where the units were to be sited, if the units were gas or oil fired, condensing or not.