Installation Instructions

Installation Manual
Page
16
Installation - Venting
-Exhaust vent (Stainless steel vent)-
This is a Category IV appliance and must be vented accordingly. The vent system must be sealed
airtight. All seams and joints without gaskets must be sealed with high heat resistant silicone sealant
or UL listed aluminum adhesive tape having a minimum temperature rating of 160° F. For best results,
a vent system should be as short and straight as possible.
• The micro-boiler is a Category IV appliance and must be vented accordingly with any 4 inch
vent approved for use with Category III / IV or Special BH type gas vent.
• The manufacturer recommends the NovaVent (Z-Vent) line. However, the following are also
UL listed manufacturers: ProTech Systems Inc. (FasNSeal), Metal-Fab Inc., and Heat-Fab Inc.
(Saf-T Vent).
• Follow the vent pipe manufacturer's instructions when installing the vent pipe.
• The maximum length of exhaust vent piping must not exceed 100 ft. (30.5 m) (deducting 5 ft.
(1.5 m) for each elbow used in the venting system). Do not use more than 5 elbows.
• When the horizontal vent run exceeds 5 ft. (1.5 m), support the vent run at 3 ft. (0.9 m)
intervals with overhead hangers.
Vent connections for two-pipe
1. Connect 4" stainless steel vent straight
pipes directly on the exhaust / intake
vent collar of the micro-boiler.
1. Connect a 4" stainless steel vent straight
pipes directly on the exhaust vent collar
of the micro-boiler.
2. Connect a 4" elbow directly on the
intake vent collar of the micro-boiler.
Vent connections for single pipe
No. of Elbows Max. Vertical or Horizontal Vent Length
0 100 ft. (30.5 m)
1 95 ft. (29.0 m)
2 90 ft. (27.4 m)
3 85 ft. (25.9 m)
4 80 ft. (24.4 m)
5 75 ft. (22.9 m)
Excludes vent terminators, termination elbows, or rain caps.
Diameter Max. No. of Elbows Max. Vertical or Horizontal (Total) Vent Length
4 in. (102 mm) 5 100 ft. (30.5 m)
* For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
4" stainless
steel vent
straight pipe
Exhaust vent
collar (Female)
Intake vent collar
(Female)
4" stainless
steel vent
straight pipe
Exhaust vent
collar (Female)
4" stainless
steel vent
straight pipe
Intake vent
collar
(Female)
4" elbow
with bird
screen