Whirlpool UXI1200DYS Installation Guide - Page 4
Venting Requirements
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Venting Requirements ■ The vent system must terminate to the outdoors. ■ Do not terminate the vent system in an attic or other enclosed area. ■ Do not use 4" (10.2 cm) laundry-type vent or wall caps. ■ Use round, metal vent only. Rigid metal vent is recommended. Plastic or metal foil vent is not recommended. ■ The length of the vent system and number of elbows should be kept to a minimum to provide efficient performance. For the most efficient and quiet operation: ■ Use no more than three 90° elbows. ■ Make sure there is a minimum of 24" (61.0 cm) of straight vent between the elbows if more than 1 elbow is used. ■ Do not install 2 elbows together. Typical In-line Blower System Installations A 10" (25.4 cm) round vent system is needed for installation (not included). The in-line blower system inlet and outlet openings are 10" (25.4 cm) round. The exhaust (outlet) opening on the range hood must also be 10" (25.4 cm) round. NOTE: Flexible vent is not recommended. Flexible vent creates back pressure and air turbulence that greatly reduce performance. The vent system can terminate either through the roof or wall. NOTE: Plywood may be used as a mounting base to span open areas between ceiling joists and rafters. If used, be sure to use plywood capable of supporting the weight of the in-line blower system (50 lb [22.6 kg]). ■ Use clamps to seal all joints in the vent system. ■ The vent system must have a damper. ■ Use weatherproof caulking to seal the exterior wall or roof opening around the cap. ■ The size of the vent should be uniform. Cold weather installations An additional back draft damper should be installed to minimize backward cold air flow and a thermal break should be installed to minimize conduction of outside temperatures as part of the vent system. The damper should be on the cold air side of the thermal break. A The thermal break should be as close as possible to where the vent system enters the heated portion of the house. D E E B C Makeup air Local building codes may require the use of makeup air systems when using ventilation systems greater than the specified CFM of air movement. The specified CFM varies from locale to locale. Consult your HVAC professional for specific requirements in your area. A. Mount on top of ceiling joists. B. Mount from cross-members tied to trusses. C. Duct horizontal, mount to cross-members tied to trusses. D. Mount on underside of rafters. E. Plywood 4