HTP EL-399 - Manual (Page 39)

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LP- 293 REV. 5.20.14
If an existing venting system is converted for use with this boiler, the installer must ensure that the existing venting system is clean and
free from particulate contamination that could damage the boiler. Failure to do so could result in property damage and boiler failure.
Such failure IS NOT covered under warranty.
VENT / AIR INLET SIZE MINIMUM EXISTING VENT / CHASE SIZE
2” 4”
3” 5”
4” 7”
Table 13 – Minimum Vent / Chase Sizing
2. VENTING AS A CHASE
When venting as a chase, follow all instructions included in Part 5
–
Venting, Sections A – G of this manual, as well as the previous
Concentric Venting section. See Figure 19 for chase venting
demonstration.
NOTES:
A. For every 1” of overhang, the exhaust vent must be located 1”
vertical below overhang (overhang means top of building structure
and not two adjacent walls [corner of building]).
B. Typical installations requ
ire 12” minimum separation between
bottom of exhaust outlet and top of air intake.
C. Maintain 12” minimum clearance above highest anticipated snow
level or grade (whichever is greater).
D. Minimum 12” between vents when installing multiple vents.
E. 12” minimum beyond air intake.
F. Maintain 12” minimum clearance above highest anticipated snow
level or grade (whichever is greater).
Figure 19 – Venting as a Chase