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The combustion air comes from the outside and is vented to the outside. The cabin air is recirculated through the heat exchange just behind the burner.
Return air is supplied through openings in furnace casing. All return air
passages must be kept clear for furnace to function properly. Refer to
MINIMUM CLEARANCE TO FLOORBOARDS WALLS &
similar COMBUSTIBLE BUILDING MATERIAL. The total unobstructed return air opening size(s) must not BE LESS than specified in MINIMUM RETURN AIR SPECIFICATIONS
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. Failure to meet minimum return air requirements nullifies furnace warranty.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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