Monessen-hearth Magnum Unvented Vent-Free Fireboxes MCUF42D SERIES User Manual download pdf (Page 16)

16 26D4720

USING OPTIONAL AK-4 OUTSIDE AIR KIT

8'max.

COMBUSTION AIR

1. Locate combustion air assembly at an exterior location which is not likely to be accidentally blocked in any manner.

Locate assembly a min. of 12" above the snow line to prevent blockage by snow accumulation.

2. Never mount the combustion air inlet assembly in a garage or storage area where combustible fumes such as gasoline

might be drawn into the ﬁ replace.

3. Combustion air can be drawn from the crawl space under a house when an adequate supply of air is provided by open

ventilation.

4. CAUTION: Do not take combustion air from attic space or garage space.

5. Locate air supply inlet at least 3' away from any appliance vent terminal.

6. Avoid extremely long runs and numerous turns in the duct leading from the ﬁ replace to the combustion air assembly.

These conditions increase the resistance to the free ﬂ ow of air through the duct. See Figures 17 through 20 for methods

of installing the outside air for combustion assemblies.

Figure 17 - Basement Installation

Figure 18 - Concrete Slab Installation

(Optional Outside Air Runs)

Above

Snow

Level

Ground

Level

Basement

Wall

Firestop Spacer

Inlet Grill in

Sofﬁ t

(Overhang)

Figure 20 - 45° Corner Installation on

Slab Floor

Figure 19 - Installation Above Basement or

Crawl Space

Inside Wall

Outside

Wall

Duct Extended

to Miss Joist

To Outside Wall

Note: Fireplace model in illustrations may not be representative of your appliance.

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Monessen-hearth Magnum Unvented Vent-Free Fireboxes MCUF42D SERIES User Manual Page 16