About four in ten homes inside the Town of Dumfries are townhouses, most of them in rows built between 1974 and 1992: Williamstown, Port O’Dumfries and South Cove. A unit in the middle of a row has no side wall to exhaust through, so the dryer vent line has to leave by the front, the back or the roof, and the farther the laundry sits from that wall, the longer the line and the more corners lint can catch on.
Snow is the other hazard. Prince William County Fire and Rescue says to keep the dryer vent and the furnace exhaust pipes clear of snow during and after a storm, and on the back of a townhouse row the dryer vent hood often sits low on the wall, where a drift covers it first. A buried hood pushes lint and damp air back up the line, and on a gas dryer the exhaust with them, so dig it out before the next load.
On the county side the jobs change. Montclair is mostly single-family, three houses in four, median built 1989, and the laundry tends to sit on the main floor or in the basement with a short run out a side or back wall. Cherry Hill is newer, its median home built in 2005, with about four in ten townhouses and two in ten homes in condo and apartment buildings, where the laundry is often upstairs and the dryer vent line crosses a ceiling to get outside.
Close to four in ten Cherry Hill homes are rented, compared with about two in ten inside the Town. If you own one of those rentals, book the dryer vent cleaning while the unit sits empty between leases, and keep the dated invoice with the lease file.