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C. COMBUSTION AIR SUPPLY WITH NO BAROMETRIC DAMPER
When no Barometric Damper is used Table 1 should be used to size the air inlet pipe to the
burner air housing if using a direct vent application.
Table 1
Firing Rate Range (gph) Chimney Connector Size
0.75 to 1.00
1.00 to 1.50
1.50 to 2.25
NFPA or OEM Burner specifications should take precedence where required.
PART II. VENTING REQUIREMENTS
Oil fired appliances shall be connected to flues or vents having sufficient draft at all times to
ensure safe and proper operation of the appliance.
When venting the MUNCHKIN OFB boilers, all installations should conform to all national,
local and state codes and authorities having jurisdiction.
When no local code is in effect NFPA-31 should be used as a reference, and baseline docu-
ment.
In addition, the design of chimney connectors, chimneys, power-venting systems and direct
vent systems should also conform to local and State codes, and good industry practice. In
lieu of local codes, NFPA-211 should be used as a reference.
BAROMETRIC DAMPER
The MUNCHKIN OFB boiler does not normally require a barometric damper, but, it may be
required when the draft in the venting system is stronger than required, and the burner is
incapable of operating against a high negative over-fire pressure.
A. NEUTRAL POINT PRESSURE ADJUSTER
In some cases the chimney may produce a draft that is too excessive and beyond the con-
trol of a draft regulator. The burner in use should be a high static or air-box type. Also, if you
have a mechanical draft device at or near the outlet, you may get flame detachment, smoky
fires, and puffbacks.
Figure 1 NEUTRAL PRESSURE POINT ADJUSTER
VENTING REQUIREMENTS
5" round or equivalent
6" round or equivalent
7" round or equivalent
3
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