I inspected a side by side duplex today and was checking the code check reference for the following.
There are 2 water heaters and 2 furnaces venting in one tile flue.
Suprisingly there was no exterior deterioration to the chimney.
Is this acceptable?
Also I am disapointed with the Preston guide.
Is Ducane listed under another manufacture for air conditioners? They are listed in the furnace section.
Also for example. I am referencing a Goodman furnace M# GMP075-3
Preston has this listed from 1992 to 2000 for the same BTU. So how do you know if it is 1992 or 95 or 2000?
Why cant manufactures just list the date?