Venting a Downdraft Range
Careful planning and precise layout keep the smoke out of your eyes.
Synopsis: A step-by-step guide to planning the layout and sizing and installing the ductwork for the ventilation system of a downdraft range, including considerations for both new and replacement installations.
Early in my kitchen remodeling career, I installed my first range with a downdraft vent. The vent moves exhaust air from the range to the outside through a duct (usually in the floor), making an overhead vent unnecessary. Because they afford an unobstructed view, downdraft vents are great for islands and peninsulas. I thought the first job was going to be difficult and was surprised by how simple it was. The lesson I learned on that job, though, is that good planning is essential. With meticulous planning on the front end of the project, you can eliminate the agony that goes along with careless layout.
Know the duct’s path
To determine the path the duct will follow, you need to know where it attaches to the range and where it exits the building. The shorter and straighter the duct is between these two points, the better the downdraft vent works.
Downdraft-vent ducts don’t have to go straight down through the floor; they can go into a cabinet on either side of the range and then through the floor or toward the back of the range, into the wall and then either up or down. Most downdraft vents go through the floor, though, and careful planning to locate the hole in the floor is essential.
A new kitchen has a flexible layout
Because this project involved a new kitchen-cabinet design, I had some flexibility when I drew a full-size outline of the cabinets and range on a piece of plywood tacked to the kitchen’s subfloor. I measured from the lines representing the back and sidewalls of the range to…