Vent tube needed?

Specific Inspection Topics Inspecting HVAC Systems
1

The valve sits over the furnace. Do these blow off like a TPRV valve and have a scald risk, or is it OK as installed?

Thanks.

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2

Here are the mfgs. installation instructions:
http://www.watts.com/pdf/1910237.pdf

3

Thanks Michael,

Always good info. here. This place is great.