Whirlpool WED70HEBW Ventilation Specification - Page 4
Installation Requirements - reviews
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INSTALLATION REQUIREMENTS Local codes and ordinances that exist must also be met. Consult your local building inspector for more information. WARNING: To reduce the risk of fire, this dryer MUST BE EXHAUSTED OUTDOORS. NOTE: This guide is intended to aid licensed HVAC or Architectural Engineers who design single and multi-dryer unit venting systems for Whirlpool Corporation dryers sold in the United States. Whirlpool Corporation provides required airflow and back pressure specifications, measured at the connection between the vent system and the dryer's vent pipe, for use in the design of dryer vent systems. Whirlpool does not design multidryer vent systems, nor does Whirlpool review or provide approvals for vent systems designed by third-party engineering firms. Outside Exhaust The four basic reasons for exhausting a dryer outdoors are detailed in this section: 1. To meet codes requirements. 2. To remove moisture from laundry area. 3. To avoid lint accumulation in laundry area. 4. To remove excess heat from laundry area. Codes Requirements The following codes should be reviewed to ensure dryer vent systems are in compliance: 1. International Mechanical Code: 2009 version, sections 504 and 913. 2. National Fuel Gas Code. 3. UL 2158 Electric Clothes Dryer Standard references venting requirements. 4. ANSI Z21.5.1 - Gas Clothes Dryers. 5. Other sections of these codes may also apply to multi-dryer vent systems. There are other codes requiring dryers to be exhausted when installed in confined spaces where specified clearances from combustible surfaces cannot be met. See the Installation Instructions for the specific dryer model being used or considered for spacing requirements. Moisture A normal towel load contains some residual water when it is removed from the washer. The dryer must remove this water and discharge it from the drum. When the dryer is not exhausted outside, this moist air will be recirculated through the dryer, reducing its efficiency. Exhausting moisture into the room can also cause damage to walls, floors, picture hangers, and cause condensation on windows and walls in cold weather. Lint Even though the dryer is equipped with a lint screen, fine particles of lint will pass through the screen and be exhausted out of the dryer. Proper venting of the dryer will keep lint from accumulating in the laundry area. Heat In order to remove moisture from the garments in the dryer, heat is generated to vaporize the water. Exhausting the dryer outdoors removes excess heat from the laundry area of the building. Central Exhaust System Requirements The following guidelines should be considered in the design of any central exhaust system: ■ Exhaust individual dryers to the central exhaust duct system with proper size vents to assure adequate performance of each dryer. The dryer has 4" (102 mm) exhaust duct connections. Connect each dryer to the central vent with a 4" (102 mm) diameter aluminum vent. ■ Install weighted dampers on each individual dryer exhaust duct. These dampers may be used for balancing out the overall duct system. ■ Design the central duct system for sufficient capacity to handle the maximum number of dryers operated at one time. ■ Consider moisture, lint and air temperature in the design of the central duct system. Maximum exhaust temperature of the dryer will not exceed 200°F (93.3°C) when the dryer is operated according to the instructions provided with the dryer. ■ Provide for periodic inspection and clean-out of lint accumulated in the central duct system. Exhaust System Requirements Venting systems for Whirlpool dryers must meet the following requirements: ■ The capacity to handle up to 230 CFM (cubic feet per minute) of air flow for each dryer in the system. ■ A minimum back pressure of -0.1" (-2.5 mm) water column (vacuum) when measured at the connection to the dryer. 4