air supply inlet

[Glevin]

What is the difference between nonmechanical and mechanical air supply?

I am investigating purchasing a tankless water heater. When deciding location, horizontal vent location appears to be a big issue.

The distance between the HVAC air supply inlet and the water heaters concentric, combustion air inlet differs between mechanical and nonmechanical systems.

My HVAC unit is in the basement. I have a duct (?fresh air?) going from outside to the return plenum before the filter. Would this be considered a nonmechanical air supply inlet?

Thank you.

[George2]

What is the difference between nonmechanical and mechanical air supply?

I am investigating purchasing a tankless water heater. When deciding location, horizontal vent location appears to be a big issue.

The distance between the HVAC air supply inlet and the water heaters concentric, combustion air inlet differs between mechanical and nonmechanical systems.

My HVAC unit is in the basement. I have a duct (?fresh air?) going from outside to the return plenum before the filter. Would this be considered a nonmechanical air supply inlet?

Thank you.

Non-mechanical. That (fresh air) can be omitted, if you think your house is loose enough.

We (at one time) had to install fresh air intakes (new construction) here to be in code.

But now we don't when they figured out the homes were already loose as a goose.

It'll depend on how tight your house is.

[dandyme]

1- you gotta read first


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[Glevin]

Thanks for the help

[Tech23]

Welcome to the site.