IKEA LUFTIG Installation Instructions And Use & Care Manual

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6Cold Weather InstallationsAn additional back draft damper should be installed to minimizebackward cold air flow and a thermal break should be installed tominimize conduction of outside temperatures as part of the ventsystem. The damper should be on the cold air side of the thermalbreak.The break should be as close as possible to where the ventsystem enters the heated portion of the house.Makeup AirLocal building codes may require the use of makeup air systemswhen using ventilation systems greater than specified CFM of airmovement. The specified CFM varies from locale to locale.Consult your HVAC professional for specific requirements in yourarea.Venting MethodsVent system can terminate either through the roof or wall. Use7" (17.8 cm) or larger round vent with a maximum length of50 ft (15.2 m) for vent system.NOTE: Flexible vent is not recommended. Flexible vent createsboth back pressure and air turbulence that greatly reduceperformance.Calculating Vent System LengthTo calculate the length of the system you need, add theequivalent feet (meters) for each vent piece used in the system.7" (17.8 cm) Round Vent SystemExample vent systemRoof Venting Wall VentingA. 7" (17.8 cm) round ventthrough roof(purchased separately)B. Roof cap with damper(purchased separately)C. 24" (61.0 cm) min. above thecooking surfaceA. 7" (17.8 cm) round vent outthe top and through the wall(purchased separately)B. Wall cap with damper(purchased separately)C. 24" (61.0 cm) min. above thecooking surfaceABCABCVent Piece Round45° elbow 2.5 ft(0.8 m)90° elbow 5.0 ft(1.5 m)7" (17.8 cm) wall cap 0.0 ft(0.0 m)3¹⁄₄" x 10" (8.3 cm x 25.4 cm)to 7" (17.8 cm)4.5 ft(1.4 m)3¹⁄₄" x 10" (8.3 cm x 25.4 cm)to 7" (17.8 cm) 90° elbow5.0 ft(1.5 m)Maximum Recommended Length = 50 ft (15.2 m)1 - 90° elbow = 5.0 ft (1.5 m)1 - wall cap = 0.0 ft (0.0 m)8 ft (2.4 m) straight = 8.0 ft (2.4 m)Length of 7" (17.8 cm) system = 13.0 ft (3.9 m)Wall cap7" (17.8 cm) round90˚ elbow2 ft (0.6 m)6 ft (1.8 m)