Alliston
- Dominant build type in Alliston: modern infill 2-storey — average vent run 18–32 ft.
- Most common failure: flex-foil transition + over-length rigid, no booster fan.
- Typical service in Alliston: full clean + rebuild first 6 ft in rigid smooth-wall.
- Same-week booking across Alliston; emergency (no dry / overheat) same-day.
