Assessments - 3, GPA: 3.3
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. Use only duct work constructed of materials that are acceptable by the applicable codes. All duct should be 26 gauge or heavier to minimize flex due to air flow. . The remote blowers require a 10” or 6” diameter round duct (depending on model) to match the inlet ring. A transition is necessary from other duct sizes. . Use sheet metal screws as required to support the duct weight, and seal all joints with duct tape. . Be certain that the duct work does not interfere with floor joists or wall studs. . Do not exhaust more than one vent into a single duct run. . Cold weather installations should have an additional backdraft damper installed to minimize backward cold air flow and a nonmetallic thermal break to minimize conduction of outside temperatures as part of the ductwork. The damper should be on the cold air side of the thermal break. The break should be as close as possible to where the ducting enters the heated portion of the house. . Always use an appropriate roof or wall- cap with damper. Laundry type wall caps should never be used. Step 2: Prepare Countertop Cutout Refer to the cooktop installation instructions for dimensions of cooktop, countertop cutout, and cabinet requirements prior to making any cutouts. Cooktop depth and countertop back-splash depth can vary greatly from one to another. These variations may cause the fit of the downdraft and cooktop to be tight. A countertop (front edge) with a raised lip and/or a wide backs- plash (back edge) may not allow enough flat countertop for a proper installation. Y Check that the cooktop is far enough forward that the downdraft will fit behind it. Verify all dimensions prior to cutting the countertops. Use the physical products to confirm cutouts whenever possible. For all installations verify that all cutouts will clear the inside of the front countertop support rail, and that the cooktop and vent will be centered left to right within the cutout. Also, make certain that the front and rear cutouts are straight and parallel to the front edge of countertop and the rear backsplash and/or wall. Assure that the side cutouts are square to the front and rear cutouts. All illustrations and dimensions are based on standard 24” deep by 36” high American style base cabinets with 25” countertops. When installing laminated or solid surface countertops such as Surell™ and Corian®, be sure to follow the countertop manufacturer’s instructions regarding minimum comer radii, reinforcement of corners, etc. Note: Check boxes as tasks are completed. For overhead cabinet and cooktop side clearances consult cooktop Installation Instructions. INSTALLATION WITH COOKTOPS Fig. 7 Wide 31”: 283/ 8” Wide 37”: 343/ 8”Cutout and Overall Dimensions Cutout and Overall Dimensions Notes Dimension ”SB” is the minimum distance from the leading edge of the counter to the leading edge of the cutout. Dimension ”BT” is the thickness of backsplash that provides 1/4” clearance between vent and backsplash. Any backsplash with a curved radius where it meets the counter will require additional clearance. Thicker backsplashes may be used by increasing the counter and cabinet depths. Set the cooktop into the countertop opening so that the back edge of the cooktop overlaps the leading edge of the downdraft. 11 Fig. 8 Step 3: Prepare Duct Cutouts in Cabinet Y A. Refer to Figure 8. Drop a plumb-line from Point ”P” at the rear center of the countertop cutout. Mark this point on the bottom of the cabinet below. Construct two reference lines through this point: one should be parallel to the cabinet front and directly below the rear counter- top cutout (Line A-A), and the other (Line B-B) should be at right angles to A-A. Y B. Using these reference lines as a base for the measurements, layout the neces- sary cabinet cutouts needed to imple- ment the planned ductwork route. Where a range of measurements is noted, choose a measurement that allows best clearance from wall studs, floor joists, utilities, or other obstructions. Step 3: Prepare Duct Cutouts in Step 3: Cabinet Y C. Before cutting for ducting, temporarily set intake and cooktop in place and attach integral blower (or duct transition fitting if a remote or inline blower is instal- led). Refer to steps 6 and 7. Verify that the duct cutouts as marked will match the hardware installation. Adjust the duct cutout as necessary to match hardware installation. Y D. Remove temporarily placed hardware and make cutouts in cabinet to accom- modate ductwork installation. Y E. Make all other cabinet modifications needed to provide proper clearances for drawers or removable shelving. Note: Check boxes as tasks are completed. Center Line (CL)/ Plumline Point "P" Step 4: Install Ductwork (Remote or Inline Blower, If Used) Y A. Install the ductwork and remote blower (if used) in accordance with the ductwork routing plan developed in Step 1. Y B. Make sure that the installation complies with all installations guidelines. Type and length of ducting and lack of makeup...
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