Venting a dryer vertically


Old 01-03-05, 05:37 PM
Andy C's Avatar
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Venting a dryer vertically


I wish to install a gas clothes dryer on the upper floor of my row house. I've read (Peter Hemp's excellent "Plumbing A House") that dryers should be vented downward for lint reasons. Well my intended location is an inner room, about 25 feet from the front wall (I'm a middle of group so don't have external side walls), and this seems too long for a dryer vent.

I'd like to know if I can vent straight up through the roof. My flat roof is 2'6" above the 9 foot ceiling upstairs. I am going to use a stacked washer-dryer where the vent is 43" above the floor. If I allow 18" above the roof, the vent would have a vertical rise of 9'6". Can I do this? I'm using smooth wall duct.

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Old 01-03-05, 08:24 PM
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Hello Andy and Welcome into my Gas Appliances topic.

The vent can be installed as described but the venting system will require cleaning far more often. The heavy moisture ladden lint will collect at the base of the ducting nearest the machine and inside the blower housing. That ecessive lint will cause the drying times to be extended when too much lint collects.

Maximum Exhaust Vent Lengths:
4 Inch Rigid Metal Ducting with 4 Inch Vent Hood.
#of elbows:
0 elbows...44 feet
1 elbow....34 feet
2 elbows..26 feet
3 elbows..20 feet

Above With 2 Inch Vent Hood:
0 elbows...34 feet
1 elbow....26 feet
2 elbows..20 feet
3 elbows..14 feet

Maximum Exhaust Vent Lengths:
4 Inch Flexible Metal Ducting with 4 Inch Vent Hood.
0 elbows...24 feet
1 elbow....20 feet
2 elbows..16 feet
3 elbows..12 feet

Above With 2 Inch Vent Hood:
0 elbows...20 feet
1 elbow....16 feet
2 elbows..12 feet
3 elbows....8 feet

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