Output temp exuast

What should out put temp be of pvc exuast on a 93% Lennox 2 stage furnace on low fire, with probe inserted into the exuast apx 10 ft from the furnace. I read 93f with a calibrated thermometer placed in center flow.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.