KitchenAid KHHS179LBT Installation Instructions - Page 3

Rectangular to Round Transition NOTE: The minimum 3" (7.6 cm) clearance must exist between the top of the microwave oven and the rectangular to round transition piece so that the damper can open freely and fully. 3¹⁄₄" x 10" (8.3 x 25.4 cm) vent system = 73 ft (22.2 m) total A B 6 ft (1.8 m) A B C 3" (7.6 cm) 2 ft (0.6 m) C D A. One 3¹⁄₄" x 10" (8.3 x 25.4 cm) 90° elbow = 25 ft (7.6 m) B. 1 wall cap = 40 ft (12.2 m) E C. 2 ft (0.6 m) + 6 ft (1.8 m) straight = 8 ft (2.4 m) F 6" (15.2 cm) vent system = 73 ft (22.2 m) total A. Roof cap B. 6" (15.2 cm) min. diameter round vent C. Elbow (for wall venting only) D. Wall cap E. 3¹⁄₄" x 10" to 6" (8.3 x 25.4 cm to 15.2 cm) rectangular to round transition piece F. Vent extension piece, at least 3" (7.6 cm) high A 2 ft (0.6 m) B 6 ft (1.8 m) Recommended Standard Fittings The following length equivalents are for use when figuring vent length. See the examples in "Recommended Vent Length." A B C C D A. Two 90° elbows = 20 ft (6.1 m) B. 1 wall cap = 40 ft (12.2 m) C. 1 rectangular to round transition piece = 5 ft (1.5 m) D. 2 ft (0.6 m) + 6 ft (1.8 m) straight = 8 ft (2.4 m) If the existing vent is round, a rectangular to round transition piece must be used. In addition, a rectangular 3" (7.6 cm) extension vent between the damper assembly and rectangular to round transition piece must be installed to keep the damper from sticking. D E F G A. Rectangular to round transition piece: 3¹⁄₄" x 10" to 6" = 5 ft (8.3 x 25.4 cm to 15.2 cm = 1.5 m) B. Roof cap: 3¹⁄₄" x 10" = 24 ft (8.3 x 25.4 cm = 7.3 m) C. 90° elbow: 3¹ ₄" x 10" = 25 ft (8.3 x 25.4 cm = 7.6 m) D. 90° elbow: 6" = 10 ft (15.2 cm = 3 m) E. Wall cap: 3¹⁄₄" x 10" = 40 ft (8.3 x 25.4 cm = 12.2 m) F. 45° elbow: 6" = 5 ft (15.2 cm = 1.5 m) G. 90° flat elbow: 3¹⁄₄" x 10" = 10 ft (8.3 x 25.4 cm = 3 m) Recommended Vent Length A 3¹⁄₄" x 10" (8.3 x 25.4 cm) rectangular or 6" (15.2 cm) round vent should be used. The total length of the vent system including straight vent, elbow(s), transitions and wall or roof caps must not exceed the equivalent of 140 ft (42.7 m) for either type of vent. See "Recommended Standard Fittings" section for equivalent lengths. For best performance, use no more than three 90° elbows. To calculate the length of the system you need, add the equivalent lengths of each vent piece used in the system. See the following examples: INSTALLATION REQUIREMENTS Tools and Parts Tools Needed Gather the required tools and parts before starting installation. Read and follow the instructions provided with any tools listed here. ■ Measuring tape ■ Stud finder ■ Pencil ■ 7/16" socket wrench ■ Masking tape or thumbtacks (or box wrench) for 1/4" x 2" lag screws ■ Scissors ■ 1½" (3.8 cm) diam. hole drill ■ No. 2 Phillips screwdriver bit for wood or metal ■ No. 3 Phillips screwdriver for cabinet 1/4-20 x 3" round-head bolts ■ Keyhole saw ■ Electric drill ■ 3/16" (5 mm), 3/8" (10 mm) drill bits ■ 3/4" (19 mm) hole saw ■ Caulking gun and weatherproof caulking compound ■ Duct tape 3