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IMPORTANT: ALL duct work joints must be taped to prevent moisture and lint from escaping into the dryer and/or building. NOTE: Common (“Y”) exhaust connections of the top basket (tumbler) and bottom basket (tumbler) should be installed in such a manner that the back guards/panels can be removed easily for servicing. IMPORTANT: Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust duct area should not exceed 0.3 inches water column when both baskets (tumblers) are operating. 14 2. Single Dryer Venting Where possible, it is suggested that a separate exhaust duct be provided for each dryer. The exhaust duct work should be laid out in such a way that the duct work travels as directly as possible to the outdoors with as few turns as possible. It is suggested that the use of 90. turns in ducting be avoided; use 30. or 45. angles instead. The shape of the exhaust duct work is not critical so long as the minimum cross-sectional area is provided. IMPORTANT: Exhaust back pressure measured by a manometer at the dryer exhaust duct area should not exceed 0.3 inches water column. If the length of the duct work run or quantity of elbows used exceeds the specifications noted in this manual, the cross-sectional area of the duct work must be increased in proportion to the number of elbows or duct run added. a. Single Dryer Venting - with each basket (tumbler) independently vented all the way to the outdoors. IMPORTANT: For extended duct work runs...or where numerous elbows are used, the cross- sectional area can only be increased to an extent and a professional HVAC firm should be consulted for proper venting information. IMPORTANT: UNDER NO CIRCUMSTANCES CAN THE DRYER BE VENTED TO THE OUTDOORS USING A 6-INCH DIAMETER EXHAUST DUCT!!! Where independent exhaust ducting is used for each basket (tumbler), the connection size at the point where the internal ducting (6-inch diameter) leaves the dryer, the minimum size connection is 8-inch diameter (54 square inches cross-sectional area)...and this is only true providing; (Refer to illustration [MAN2114] on page 16 for details.) 1) The maximum duct run is no more than 20 feet. 2) The duct work is on a horizontal run (no riser). 3) There is no more than one (1) elbow...which includes the outside outlet (i.e., elbow used for outside protection). IMPORTANT: Even though the dryer’s exhaust outlet size is six (6) inches in diameter (at both the top basket [tumbler] elbow where it leaves the dryer), the minimum connection at this point of exit from the dryer is 8-inches diameter (54 square inches cross- sectional area). 15 1 16 b. Single Dryer Venting - with common (top basket [tumbler] and bottom basket [tumbler] connected together) exhaust connections. If the top and bottom baskets (tumblers) connect or “Y” together as noted is Section E1, the minimum diameter size at the “Y” or point of connections is 10 inches in diameter (80 square inches cross-sectional area). Additionally, the maximum duct work travel from the top of the dryer to the outside exhaust outlet must not exceed fifteen (15) feet. Refer to the illustration [MAN2113] located above for examples. The vertical ducting need not be a minimum of 10-inches in diameter all the way into the dryer. Connections inside the dryer can be 6-inches in diameter for the top basket (tumbler) and for the bottom basket (tumbler) increased to 8-inches up to the top area of the dryer and then at that point must be a minimum of 10-inches in diameter (80 square inches cross-sectional area). Additionally, the length of the exhaust run cannot exceed fifteen (15) feet from the top of the dryer to the point where the exhaust end outside. 3. Multiple Dryer Venting (with Common Main Duct) If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers or baskets (tumblers) may be channeled into a common main duct. Each dryer/basket (tumbler) is provided with a back draft damper. The individual ducts should enter the bottom or side of the main duct at an angle of not more than 45. in the direction of the airflow. 17 The main common duct may be any shape so long as the minimum cross-sectional area is provided. The main duct should be tapered with the diameter increasing before each individual duct is added as per the illustration [MAN2172] on page 19 and the illustration [MAN2171] on page 20. The maximum length of venting from the last dryer to where it exhausts is the following: VERTICAL --------venting run must not exceed eight (8) feet. This calculation compensates for the use of maximum of three (3) elbows including the two (2) elbows creating 180. (turned downward) outside outlet. HORIZONTAL-----venting run must not exceed fifteen (15) feet. This calculation compensates for the use of maximum of only one (1) elbow which is the outside outlet protection. IMPORTANT: No more than four (4) dryers (eight [8] baskets [tumblers]) maximum should be connected to one (1) main common duct. Refer to ...