Install and Operating Manual

Mighty Therm2
Page 11




4. If the Mighty Therm2 is side-wall vented to the
same wall, locate the vent terminal at least 3
feet (0.9m) horizontally from the combustion air
terminal, and locate the vent terminal at least 1
foot (0.3m) above the combustion air terminal (see
Figure 4).
2.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the
vent must extend at least 3 feet (0.9m) above the point
at which it penetrates the roof. It must extend at least
2 feet (0.6m) higher than any portion of a building
within a horizontal distance of 10 feet (3.0m), and high
enough above the roof line to prevent blockage from
snow. When the combustion air is taken from the roof,
the combustion air must terminate at least 12" (30cm)
below the vent terminal (see Figure 3). Seek local
municipalities and their codes for appropriate installation
techniques.

(a) For all side wall horizontally vented gas fueled equip-
ment installed in every dwelling, building or structure
used in whole or inpart for residential purposes, includ-
ing those owned or operated by the Commonwealth and
where the side wall exhaust vent termination is less than
seven (7) feet above nished grade in the area of the
venting, including but not limited to decks and porches,
the following requirements shall be satised:
 
 












 



 
cannot be met at the time of completion of installation, the




 



 
permanently mounted to the exterior of the building at a






  The state or local gas inspector of the side

prove the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and signage installed


(b) EXEMPTIONS: The following equipment is exempt from
248 CMR 5.08(2)(a) 1 through 4:
 


 
equipment installed in a room or structure separate from the


(c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT
VENTING SYSTEM PROVIDED. When the manufacturer of

ment provides a venting system design or venting system

by the manufacturer for installation of the equipment and the

 

 

(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT
VENTING SYSTEMNOT PROVIDED. When the manufac

fueled equipment does not provide the parts for venting the


 



 


(e) A copy of all installation instructions for the Product
Approved side wall horizontally vented gas fueled equip-
ment, and all the venting instructions, parts lists, and/or
design instructions for the venting system shall remain
with the appliance or equipment at the completion of the
installation.
 

http://www.Laars.com
2.3.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof, a
eld-supplied rain cap or an elbow arrangement must be
used to prevent entry of rain water (see Figure 3). The
opening on the end of the terminal must be at least 12"
(30cm) above the point at which it penetrates the roof,
and high enough above the roof line to prevent blockage
from snow. When the vent terminates on the roof, the
combustion air must terminate at least 12" (30cm) below
the vent terminal.
2.4 Common Vent Test — Boilers
When an existing boiler is removed from a
common venting system, the common venting system is
likely to be too large for proper venting of the appliances