1. Remove old venting and materials

• Remove any vinyl and plastic venting. Remove any damaged, crushed, or punctured venting.

• Remove any lint buildup at dryer exhaust port and dryer lint trap.

2. Rigid metal ducting is required

• Only a 4" rigid metal duct shall be used for dryer exhaust.

• Do not use plastic or metal foil venting.

3. Direct path

• Follow work order to vent dryer to the exterior with shortest, most direct path.

• Dryer exhaust duct must not exceed 35' in equivalent length unless fan assisted.

• Deduct 5' for each 90 degree elbow and 2.5' for every 45 degree elbow from allowable length.

4. Drill termination to exterior

• An existing termination may be used if it meet manufacturer's requirements.

• Do not terminate duct into floor cavity, ceiling cavity, crawlspaces or attics.

• Termination should be at least 3' away from intake openings and windows.

• Duct must terminate at least 12" above finished grade, and 12" away from inside corners of the building.

• Duct termination shall not be covered by porches or decks.

5. Connect ducting

• Connect duct with male fittings following directional flow of air towards termination to avoid build up of lint.

• DO NOT PUNCTURE duct, DO NOT USE SCREWS

6. Support ducting

• All exhaust duct must be supported every 4' to avoid sagging or any areas where lint may get trapped

7. Flex duct connector

• A listed flex connector may be used as a transition to connect the dryer to the duct work.

• Connector can not exceed 8' linear and can not be concealed within construction.

8. Insulate exhaust duct in unconditioned space

• If exhaust duct runs through an unconditioned space, ductwork shall be insulated with a minimum of R-8 to prevent condensation

9. Connect termination

• Exhaust terminations shall be in accordance to manufacturer's instructions.

• Exhaust duct terminations shall be equipped with a backdraft damper.

• Screens shall not be installed at the duct termination.

10. Seal outside of termination

• After securing housing for duct termination to outside of home, caulk around the termination to prevent air and water leaks.

11. Seal pipe connections

• Seal all duct connections with 181B or 181B-M listed material

• DO NOT PUNCTURE PIPE, DO NOT USE SCREWS. This will cause lint to accumulate and become a fire hazard

12. Worst Case Draft Test

• Conduct a Worst Case draft test to verify Category I, II, and III appliances are venting safely before leaving home for the day.

• Testing shall be recorded using the Utah WAP Worst Case Draft Test form.