Whirlpool GZ7930XHS Installation Guide - Page 6
Vent system, requirements
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Vent system requirements Venting system must terminate to the outside. Do not terminate the vent system in an attic or other enclosed area. Do not use 4" (10.2 cm) laundrytype wall caps Do not use plastic or metal foil vent. Vent work needed for installation is not supplied. Wall cap is not provided with interior-mounted motor. Determine which venting method to use. Vent system can extend through either the wall or roof. The length of vent system and number of elbows should be kept to a minimum to provide efficient performance. The size of the vent should be uniform. Do not install two elbows together. Use duct tape to seal all joints in the vent system. Use caulking tape to seal the exterior wall or floor opening around cap. Do not cut joist or stud. If vent cutout falls over a joist or stud, a supporting frame must be constructed. Flexible metal vent is not recommended. If it is used, calculate each foot of flexible vent as two feet of rigid metal vent. Flexible elbows count twice as much as standard elbows. NOTE: Make sure there is proper clearance within the wall or floor before making exhaust vent cutouts. Recommended vent system length: For either interior-mounted or exterior-mounted blower installations, vent system length should not exceed the maximum lengths listed in the "Maximum length of vent system" chart. (See this page for Interior-mounted vent motor; page 9 for exteriormounted vent motor.) 6 Interior-mounted vent motor Installation requirements Island location down vent Built-in cabinet locations down vent rear vent left vent right vent Vent system installed under a concrete slab using PVC sewer pipe. 6" (15.2 cm) round metal vent wall cap 12" (30.5 cm) minimum 6" (15.2 cm) round PVC coupling 6" (15.2 cm) round 90° PVC sewer pipe elbow 6" (15.2 cm) round PVC sewer pipe 16" (40.6 cm) maximum transition 6" (15.2 cm) round metal vent 6" (15.2 cm) round PVC coupling concrete slab 6" (15.2 cm) round PVC sewer pipe Tightly pack gravel or sand completely around pipe. SBCCI 6" (15.2 cm) round 90° PVC sewer pipe elbow Optional vent system installed under a concrete slab into a window well. Do not vent a gas cooktop into a window well. 12" (30.5 cm) minimum wall cap 6" (15.2 cm) round transition PVC sewer pipe 6" (15.2 cm) concrete slab round metal vent 6" (15.2 cm) round PVC coupling 6" (15.2 cm) round sewer pipe window well 6" (15.2 cm) round 90° PVC sewer pipe elbow 6" (15.2 cm) Tightly pack min. 6" (15.2 cm) gravel or sand round PVC completely coupling around pipe. SBCCI Seal the space between the outside of wall cap inlet inside of PVC coupling with caulking metal. Maximum length of vent system Vent 6" (15.2 cm) round 3-1/4" x 10" (8.3 cm x 25.4 cm) Length 35 feet (8.9 m) 35 feet (8.9 m) For best performance, use no more than three 90° elbows. If more than one elbow is used, make sure that there is a minimum of 24" (61 cm) of straight vent between any two elbows. Do not install two elbows together. It is recommended that you use round vent instead of rectangular vent, especially if elbows are required. If rectangular vent is required, it should be transitioned to 6" (15.2 cm) round vent as soon as possible. Determining the length of system you need: To calculate the length of system you need, add the equivalent feet for each vent piece that will be needed. See example for 6" (15.2 cm) round vent system.