How to Install Floor Heating Vents

What You'll Need
Heating duct
Tape measure
Floor heating vent

If you have a furnace, you’re likely to have floor heating vents that push the heat into a room. If the vents are already in place, your job is made simple: all you need to do is replace the floor heating vents. However, if you have an addition to the house, you’re going to have to put in new floor heating vents.

Step 1 - Dry Fitting

You will need to have your ductwork running all the way to the room, with the exception of the final elbow and the fitting that connects to the floor. Push the elbow into the duct and line the top and the collar against the floor. Take your pencil and draw around the collar. The section of the floor heating vent that extends through the floor should not be as big as this. However, this will give you a general guide as to where the floor heating vent will be placed. Repeat this for all the floor heating vents in the area.

Gather the measurement of the part of the floor heating vent that will extend through the floor and measure and draw the dimensions within the marks you’ve just made for the ductwork. When you’re doing this, you need to be sure that it sits square and an ample distance from the wall.

Step 2 - Sawing

Next, you need to saw through the subfloor and the hardwood floor in your room. If you’re putting carpet in the room, you will need to fit the floor heating vents before you install the carpet. Using a reciprocal saw, cut through the floor and cut roughly around the rectangle you’ve made where the floor heating vent will fit through the floor. You don’t have to be exact with this because the frame of the floor heating vent will cover any irregularities. However, you still need to be certain that the hole is big enough to accommodate the floor heating vents. Test with a vent to check the size.

Step 3 - Fitting the Duct

With the hole in place, it’s now time to fit your ductwork to the floor. Fit the elbow and the collar again, making sure they’re secure. Screw into place with sheet metal screws if necessary.

Push the collar up against the subfloor and screw it into place with wood screws. Make sure that the screws are of a short enough length so that the tips won’t go all the way through the flooring. When you’ve finished, make sure that the collar and ductwork is secure. Support with wire if necessary.

Step 4 - Fitting the Vent

Generally, a floor heating vent will use its own weight to stay in place on the floor, so there’s no need for you to do anything more. However, some people prefer to screw the floor heating vents into place. To do this, drill holes through the metal frame of the vent and use wood screws to accomplish a permanent fixture.