Magic Chef MCO160UBF User Manual - Page 3
Wall Construction, Hood Exhaust Duct
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Wall Construction Your Over-the-Range microwave oven should be mounted against and supported by a flat, vertical wall. Wall construction should be a minimum of 2" x 4" wall studding and 3/8" or more, thick drywall or plaster/lath. The oven must be attached to a minimum of one 2" x 4" wall stud. For proper installation the wall must be capable of supporting the cabinet load plus a minimum of 135 pounds, (the 85 pound weight of the microwave oven and load weight allowance of 50 pounds.) To find studs, use one of the following methods: 3/8" Drywall or Plaster / Lath Usually 16" or 24" I. Stud finder-a magnetic device which locates nails. 2" X 4" wood stud or metal stud (25 gauge or thicker) II.Using a hammer, tap lightly across the mounting surface to find a solid sound. This will indicate a stud installation. After locating the stud(s), the center can be found by: Probing the wall with a small nail to find the edges of the stud and then placing a mark half way between the edges. The center of any adjacent studs should be 16" or 24" from this mark. III. Draw a line down the center of the studs. Lag screws must be installed in these area Hood Exhaust Duct Outside ventilation requires HOOD EXHAUST DUCT. Read the following carefully. EXHAUST CONNECTION: The hood exhaust has been designed to mate with a standard 3-1/4" x 10" rectangular duct. If round duct is required, a rectangular-toround transition adapter must be used. Do not use less than a 6" diameter duct. REAR EXHAUST: If rear or horizontal exhaust is to be used, care should be taken to align exhaust with space between studs, or wall should be prepared at the time it is constructed by leaving enough space between wall studs to accommodate exhaust. MAXIMUM DUCT LENGTH: For satisfactory air movement, the total duct length of 3-1/4" x 10" rectangular or 6" diameter round duct should not exceed 140 feet of equivalent duct run. Roof Cap (24Ft) 90˚ Elbow (10Ft) 45˚ Elbow (5Ft) ELBOWS, TRANSITIONS, WALL AND ROOF CAPS, etc., present additional resistance to air flow and are equivalent to a section of straight duct which is longer than their actual physical size. When calculating the total duct length add the equivalent lengths of all transitions and adaptors plus the lengths of all straight duct sections. The diagram below shows the approximate feet of equivalent length of some typical ducts. Rectangular-to-Round Transition Adaptor (5Ft) Wall Cap (40Ft) 90˚ Elbow (25Ft) 3