Since there are major differences in the installation
procedures for both boilers and furnaces, the only way to
ensure that a system is properly installed is to follow the
appliance manufacturer's instructions.
36 National Oilheat Research Alliance
Figure 1
Conduction
Stainless Steel or Polypropylene
Systems—Boilers
The same situation exists with the venting of
boilers as with furnaces—there are a number of
requirements that must be met and the specific
manufacturer’s instructions must always be
followed.
There is no “standard” set of instructions;
different models of the same boiler have differ-ent
allowable vent lengths.
Terminal Location
The terminal location requirements for
condensing appliances are similar to those for
power vent systems.
Because the appliance is likely to produce
a visible plume due to condensation, surfaces
close by will be coated with water vapor. The
exhaust vent should be located in an area
where the condensation will not cause an
unsafe condition as, for example, under a deck
where icing could result.
Figure 3 shows recommendations by some manufacturers for
terminal locations specific to condensing appliances.