Monessen-hearth Magnum Unvented Vent-Free Fireboxes MCUF42D SERIES User Manual download pdf (Page 18)

18 26D4720

MODEL AK-4 COMBUSTION AIR ASSEMBLY (CONTINUED)

7. If the duct is the insulated type, push the insulation back from one end of

the duct approximately 2". See Figure 24.

8. Slip the exposed end of the duct over the starting collar on the ﬁ replace.

9. Using the sheet metal screws provided, secure the duct end to the collar

attached to the ﬁ replace.

10. Nail or screw the combustion air assembly to the surface of the wall.

Note: If the wall covering is brick or stone, use appropriate

masonry fasteners. If necessary, splice the duct. Use a model

403-duct connector to splice duct sections.

INSTALLING MODEL 403 DUCT CONNECTOR

1. Push insulation back approximately 2" from the end of each duct.

2. Slip each duct over duct connector until an equal length of connector extends into each duct.

3. Place duct clamp over the end of each duct. Tighten duct clamp down snuggly.

4. Push insulation back into place and over duct clamp.

Figure 24 - Installing Duct

Connector 403

Approximately

Insulation

Duct

Connector

Duct Clamp

USING OPTIONAL AK-4 OUTSIDE AIR KIT

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Monessen-hearth Magnum Unvented Vent-Free Fireboxes MCUF42D SERIES User Manual Page 18