The duct's effective length after adding penalties for each fitting — not the tape measure distance.
The number that actually governs whether a dryer run is compliant. Straight duct counts at its real length; fittings add equivalent length on top — roughly 5 feet for a 90-degree elbow and about 2.5 feet for a 45. A run measuring 15 feet with four 90s has a developed length near 35 feet, which is the residential maximum. This is why a short-looking run in the middle of a house can be over the limit.
We work on developed length every week across DFW. CSIA-certified, written quotes, financing available.
Flat fee confirmed when you book. Same-week scheduling. A pass/fail verdict within 48 hours.
No airflow, overheating dryer, burning smell, or a vent you're not sure about? We answer 7 AM to midnight and the assessment ends in a written safe-to-use verdict — including a do-not-use notice when the evidence supports one. After-hours dispatch runs subject to crew availability.
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