How long can the exhaust vent run be for the Thin Twin?
The maximum length depends on the type of vent and number of 90° turns. For 4-inch diameter rigid metal vent with no 90° turns, the maximum length is 42 feet, and for flexible metal vent with no turns, the maximum is 26 feet. Each additional 90° turn reduces the maximum allowable length. (Page 4)
From the official Whirlpool Thin Twin manual, page 4
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