E-16
Enerco | Heatstar ERXL Series Heater
Operating Instructions and Owner’s Manual
FIGURE 10: Unvented Operation
36”
36”
A
1. Ventilation equal to 4 CFM per 1,000 BTU/HR firing rate must
be provided in unvented heater installations
2. For dimensions A "unvented" refer to ( Figure 1- Minimum
Clearances to Combustibles.)
FIGURE 10A: Single Wall
Single wall vent run
Single wall terminal end
FIGURE 10b: Double Wall
Double wall vent run
Double wall terminal end
FIGURE 11: Vertical Venting
18" (45cm)
18" (45cm) Min. 3'-0" (91cm) Min.
8"(20cm) to 10"(25cm) Max.
6' (182cm) Min.
18" (45cm) Min.
3'-0" (91cm) Min.
6' (182cm) Min.
2"(5cm) Clearance thimble
2"(5cm) Clearance thimble
required when flu pipe
extends through
combustible materials
(91cm)
(91cm)
Pitch flue pipe down
toward outlet 1/4" per
foot (0.6 cm per 0.3m) for
condensate drainage.
Pitch flue pipe down
toward outlet 1/4" per
foot (0.6 cm per 0.3m) for
condensate drainage.
