Part I. Combustion Air And Ventilation; Fresh Air Intake; Air For Combustion - Munchkin OFB Venting Manual

COMBUSTION AIR AND VENTILATION
The purpose of this manual is to guide an installer through the installation of a MUNCHKIN
OFB boiler for use in any venting application considered as 'good industry practice' and
must conform with all Federal, State and local codes requirements and further follow the
guidelines called out in NFPA31 and NFPA211.

PART I. COMBUSTION AIR AND VENTILATION

If a MUNCHKIN OFB is being used for a retrofit and is installed in a full basement with ade-
quate infiltration for combustion air it may be installed in the usual way following accepted
industry guidelines and good industry practices.
A. FRESH AIR INTAKE
Recent energy conservation practices have resulted in many people insulating and caulking
their homes to a level where the fresh air required for efficient combustion is not always
readily available. Particularly if you choose to isolate your MUNCHKIN OFB in an enclosed
area of your home, a fresh air intake must be installed in this area.
B. AIR FOR COMBUSTION
The MUNCHKIN OFB boiler must have an assured supply of combustion air. A dedicated
outside supply of air through an installed duct or pipe should be installed at or within 5 ft.
of the boiler. A shut-off damper may automatically control the supply duct when the unit is
not operating, but the operating automatic damper must 'fail' in the open position. The com-
bustion air duct must have direct access to the outdoors and have a rain hood and insect
screen installed at the outside wall.
Care should be taken when the boiler is to be installed within a home where the operation
of exhaust fans, attic fans, kitchen ventilation systems, new high efficiency clothes dryers or
fireplaces may create severe negative vent pressures and unsatisfactory combustion and
venting conditions. Special provisions should be made for additional make-up air to supply
the other air requirements.
In cases of electric heat conversions or any structure of tight construction an opening of one
(1) square inch of minimum free area per 1000 BTU per hour of burner input must be pro-
vided. The air supply to the burner must be provided directly to the burner and originate
outside the structure within five feet (5') of the burner. The inlet vent must originate on the
same wall surface as the boiler outlet vent, if a direct venting system is used. The inlet hood
should be waterproof and include a bug and bird screen.
In cases where the boiler is installed in an area where exhaust, kitchen or bath ventilation
systems and fans exist, they may create unsatisfactory combustion or venting conditions.
Special consideration should be made for additional air.
All combustion air and ventilation requirements should meet local code and or NFPA
Standard 31 and NFPA 211.
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