How to Make an Inline Fan

An inline fan fits inside your ductwork. The fan pulls air out of a room through a vent and exhausts it to the outside. You might want an inline fan in the ceiling above a bathroom, or in a workshop where you want to prevent hazardous fumes from gathering. Because the fan is inside a duct tube, it is quiet. You can make your own inline fan by making a coupling in your existing ductwork and inserting a fan. Your inline fan will have more exhaust capability than you would get from placing a fan in a window.

Box window fan
2 ductwork ceiling boxes
Duct tape

Instructions

- 1
  Find a joint in your ductwork in your attic. Remove any duct tape and pull the joint apart. This will be the location for your inline fan. Inspect the ends of the ducts where you have separated the joint to make sure the edges are even. If you find uneven edges, replace that duct.
- 2
  Insert the end of a ceiling box into the duct coming from your ceiling vent. A ceiling box has a round duct on one end and a box on the other. Insert the round end into your duct. Seal it with duct tape. Push the box end up to your box window fan. Tape around the box to seal it to the fan. Seal it to the back side, or the intake side, of the fan.
- 3
  Tape a second ceiling box to the exhaust side of your fan. Insert the round duct of the ceiling box into your ductwork. Tape around this spot with duct tape. You now have a duct with a box in the middle of it, and a fan sitting in the middle of that box.
- 4
  Plug in the window fan and check the seals for leaks. Listen closely for rushing air and tape any spots that are not properly sealed.

How to Install a Duke Power Heat Pump

How to Make a Tube-in-Tube Heat Exchanger

Energy Efficient Homes