American Dryer Corp MD-170PTVW, MDG-120PVV installation manual Multiple Dryer Common Venting

4. Multiple Dryer (Common) Venting

IMPORTANT: For extended ductwork runs, the cross-sectional area of the ductwork can only be increased to an extent. When the ductwork approaches the maximum limits as noted in this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm should be consulted for proper venting information.

If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be channeled into a “common main duct.” The individual ducts should enter the bottom or side of the main duct at an angle not more than 45º in the direction of airflow. The main duct should be tapered, with the diameter increasing before each individual duct is added.

IMPORTANT: No more than 4 dryers for the MDG-120 and only 3 for the MD-170 should be connected to 1 main common duct.

The illustration below shows the minimum cross-sectional area for multiple dryer round or square venting. These figures must be increased if the main duct run from the last dryer to where it exhausts to the outdoors is longer than 12 feet (3.656 meters) or has more than 1 elbow in it.

A = MDG-120 14-inch (35.56 cm)

MDG-170 18-inch (45.72 cm)

MDS-170 20-inch (50.8 cm)

B = 20 feet (6.10 meters)

NOTE 1 Opening from combustible materials must be 2-inches (5.08 cm) larger than the duct (all the way around). The duct must be centered within this opening.

NOTE 2 Distance should be 2 times the diameter of the duct to the nearest obstruction.

Multiple Dryer Venting with 14-inch (35.56 cm) Diameter

2,150 cfm (60.88 cmm) Exhaust Connections at Common Duct

			MDG-120	NUMBER OF DRYERS			4		3	2	1
				MINIMUM CROSS-		SQ IN	455		380	255	115
				SECTIONAL AREA		SQ CM	2935		2452	1645	742
				MINIMUM ROUND		IN	24		22	18	14
				DUCT DIAMETER		CM	60		55	45	35
	Multiple Dryer Venting with 18-inch (45.72 cm) Diameter								Multiple Dryer Venting with 20-inch (50.8 cm) Diameter
3,700 cfm (104.77 cmm) Exhaust Connections at Common Duct								4,400 cfm (124.59 cmm) Exhaust Connections at Common Duct
170-MDG	NUMBER OF DRYERS			3	2	1		170-MDS	NUMBER OF DRYERS			3	2	1
	MINIMUM CROSS-	SQ IN		615	455	255			MINIMUM CROSS-		SQ IN	707	531	315
	SECTIONAL AREA	SQ CM		3967	2935	1645			SECTIONAL AREA
											SQ CM	4561	3426	2032
		IN		28	24	18
	MINIMUM ROUND								MINIMUM ROUND		IN	30	26	20
	DUCT DIAMETER	CM		71	61	46			DUCT DIAMETER		CM	76	66	51

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