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Certified by the Chimney Safety Institute of America
On Staff:
Certified Dryer Exhaust Technician (C-DET)
Dryer dangers

Lint removalReduce fire hazardDryer Vent Cleaning prevents fires, dryer downtime and irate tenants.

We remove lint, bird nests and articles of clothing from dryer vents in homes, beauty salons, apartments and condos. DuctPro Power Vacuum Service uses high-powered vacuum trucks to clean dryer vents as well as air ducts and, furnaces, and loose insulation.

The information below is provided as a courtesy. Our source for this data is the Chimney Safety Institute of America and the standards currently published as the International Mechanical Code (IMC). Please consult the Owner’s Manual of your clothes dryer for additional information and for cautions that may be specific to your region or to your appliance.

Dryer exhaust systems should be independent of all other venting systems. Clothes dryer exhaust must not be connected to a gas vent connector, a gas vent or a chimney. Clothes dryers should only be connected to ductwork designed specifically for exhausting that particular appliance.

Two Duct Systems
Most clothes dryers actually have two separate ducts or duct systems. One is called the connector or transition duct. This is the short (8’ or less in length) duct that normally connects the exhaust vent of the dryer to an opening in a nearby wall. This wall opening is the entry point for the second duct or duct system, called the main duct, which is often concealed inside walls, ceiling or attic spaces, and must lead always and only to outside air.

The connector duct must be secured to the dryer and to the wall opening using heat-resistant metal tape, never with screws, rivets or any fasteners that protrude into the interior of the duct. Protrusions into the duct cause turbulence in the airflow and collect lint, reducing the efficiency of the duct system. The main dryer duct, at the point at which it connects to outside air, must have an exhaust hood with a self-closing damper to prevent backdraft and entry of small animals.

Both the connector duct and the main duct must be a minimum of 4” in diameter. A one-half-inch buildup of lint in a 4” diameter duct reduces its efficiency by 44%. The length of the connector duct must not exceed eight feet. The length of the main duct must not exceed 25 feet (note: for each forty-five degree bend, add 2 ½ feet to the total duct length, and for each ninety-degree bend, add 5 feet to the total duct length).

Both connector and main ducts must be metal (either rigid or flexible) and be thick enough, minimum 28 gauge, to be non-combustible. Metal foil does not qualify and can be easily ignited. Plastic, of course, is a distinct fire hazard and must never be used in either duct.