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User Manual - Page 16

For 60K-BTU-20FT-TUBE-HTR-180.

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16
Mr. Heater 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 u pipe
extends through
combustible materials
(91cm)
(91cm)
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