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Product Help | KitchenAid

Correct Installation of a Downdraft Ventilation

Checking the Installation for your KitchenAid Downdraft Vent

Cooktop with downdraft

What is the Length of the Vent System?

  • To provide efficient performance, the length of the vent system and the number of elbows should be kept to a minimum. 
  • The maximum equivalent length of the vent system is 60 ft (18.3 m). For specific information, refer to your appliance's installation instructions.
  • For best performance at altitudes above 4,500 ft (1372 m), reduce the recommended vent run by 20%.

Was the Correct Vent Material Used?

  • Use a 26-gauge minimum galvanized vent or a 25-gauge minimum aluminum metal vent.
  • Poor-quality pipe fittings can reduce airflow.
  • A flexible metal vent is not recommended. 
  • Metal ducts may be reduced to 30-gauge galvanized steel or 26-gauge aluminized steel if allowed by local codes. This reduction is based on information in the International Residential Codes Section M1601.1 (2006 edition).

NOTE: Local codes may require a heavier gauge material.

How Many Elbows Were Used?  

  • Use no more than three 90° elbows.
  • Do not install two elbows together. If more than one elbow is used, ensure a minimum of 18" (45.7 cm) of straight vent between them. Elbows too close together can cause excess turbulence that reduces airflow.
  • If an elbow is used, install it as far away as possible from the hood’s vent motor exhaust opening.
  • Do not use a 5" (12.7 cm) elbow in a 6" (15.2 cm) or 3¼" x 10" (8.3 cm x 25.4 cm) system.

Other Recommendations:

  • Do not reduce to a 5" (12.7 cm) system after using 6" (15.2 cm) or 3¼" x 10" (8.3 cm x 25.4 cm) fittings.
  • Avoid forming handmade crimps. Handmade crimps may restrict airflow.
  • Use a vent cap for proper performance. If an alternate wall or roof cap is used, be certain the cap size is not reduced and that it has a back draft damper.
  • Use vent clamps to seal all joints in the vent system.
  • Use caulking to seal the exterior wall or roof opening around the cap.

Watch the video below for instructions on the installation of the UXD8630DYS Model downdraft vent:

If you would like to download or view product literature for your appliance, please visit our Manuals and Literature page.