DIRECT VENT APPLICATIONS
7
PART VI. DIRECT VENT APPLICATIONS
When using MUNCHKIN OFB- Models 3MOFB, 4MOFB AND 5MOFB on 'sealed' or 'direct'
vented systems, they must be ordered from the factory with a Direct Vent System manu-
factured by Flex-L International, Inc. whose part numbers are at the end of this section.
Figure 3
In addition to all of the previous stated information regarding Natural Draft Applications and
Mechanical Draft Applications the following additional instructions for Direct Vent
Applications must be followed while referencing
Figure 3;
• The maximum wall thickness should be no more than 14". Contact HEAT TRANS-
FER PRODUCTS, INC. for recommendations in case of a thicker wall.
• That the Heat Transfer Products, Inc. Flex-L System is not designed for common
venting. Use this for a single appliance only unless otherwise approved.
• Utilize an appliance adapter test port for combustion testing as required by Flex-L.
• Follow the national codes for the installation of oil burning equipment: in USA -
NFPA 31, in Canada - CAN/CSA-B139 and local regulations.
A. INSTALLING THE JOINT ASSEMBLY
1) Loosen the gear clamps attached to the adapter sleeve and slide the adapter sleeve over
the vent pipe,
Figure 4
and
Figure 5, page 8.
2) Pull the corrugated inner tube out of the vent pipe for easy access to insert the adapter.
3) Apply sealant around the corrugated end of the adapter.
4) Align the flat seams at the end of both corrugated tubes and insert the adapter into the
vent tube. Screw the adapter into the vent pipe with a counter-clockwise motion. The
