Most homes have an exhaust fan over the stove to light and ventilate. If your home doesn't have one, or if yours needs to be replaced or improved (for example, if it doesn't have an outside air vent), the process of installing one of these isn't that complicated. With a little experience, this is an improvement to your home that you can easily do on your own. Follow these instructions, and you should be able to get this straightened out in just one afternoon.
Part 1 of 6: Preparing for Installation
Step 1. Check if you need a license
Depending on where you live, you may need a municipal permit to continue the project. Check real estate codes to find out if you need one of these and, if so, how to get it.
Step 2. Measure the space
Always measure the space where you plan to install the hood to ensure it will fit.
Also, make sure the hood is about 60 to 75 centimeters above the stove and that it covers the entire area of the burners. In an ideal design, the hood will be about 8 centimeters beyond the limits of the stove
Step 3. Turn off the power
Go to the circuit breakers and turn off the power to the area where you will be working. This is necessary to avoid electrical shock during installation.
Step 4. Remove the old hood
If you already have an exhaust fan installed, start by removing the filters, and then the protection that covers the fan and motor. Finally, disconnect the wires and unscrew the hood.
- Have someone hold the hood while you remove the screws, preventing it from falling out.
- This is a good opportunity to use a voltmeter to make sure the power is really off before proceeding.
Step 5. Open your new appliance
Remove the fan, exhaust, tubes and all other parts from the packaging.
If fan and filters are together, separate them to reveal wiring. It may also have a panel over the wiring that must be removed
Step 6. Remove the tube and wiring passages
Decide which way the wiring will go and the direction the pipe will go (either up or behind the hood) according to your old hood installation. The new hood will have some pre-cut areas that can be removed with the help of a hammer and a phillips wrench, and can then be adjusted according to which side the hole is on.
- Do this carefully so as not to damage the metal of the hood when removing the wiring passages.
- The wiring passage will likely be a little round hole.
Step 7. Make some scratches
The next step is to scratch the wall where you will cut for the air outlet and wiring.
- One way to do this is to lift the hood to where you want to install it and have someone trace the holes inside it with a pencil.
- You can measure holes and space, find the center of the wall, and align holes according to calculations. This method works well if you don't have anyone to help. The manual that came with your hood probably explains how to trace these hazards to the holes.
- Plan both the tube and the wiring.
- If the pipe and wiring holes of your new hood fit snugly with those of the old one, you may not need to scratch or open your wall. In this case, you can skip parts 2 and 3 entirely and work with the existing holes and piping.
Part 2 of 6: Making a hole
Step 1. Drill reference holes
Use a drill with a long tip to drill holes in the corners of the square you drew. Drill all the way through the inside of the wall, until coming out through the outside of it.
- The holes on the outside of the wall must line up perfectly with the holes on the inside so that you can install the pipe cover on the outside well in line with the inside piping.
- If your stove is leaning against an inside wall, you will need to install extra piping to create an exit to the outside of the house. Piping can go over the top of the cabinets and between the ceiling beams, and then out through the nearest wall.
- It doesn't matter how you piping, as long as it goes outside the house. Never make an exhaust duct that ends in your attic or anywhere else in the house. This can create serious mold problems.
Step 2. Drill hole for air outlet and wiring
Using a plaster saw (the tutorial is for American walls, which are different from ours. My suggestion is to call a bricklayer if you are unsure to perform the procedure), make the hole you drew in the wall, sawing from a hole until the next.
Drilling a hole in the scratches to pass the wiring will make the cut easier
Step 3. Pull the wires
Pull at least 30 centimeters of wiring through the hole to connect to the hood.
Step 4. Drill the air outlet hole
Go outside your house and find the holes you made earlier. Use them to scratch the next cuts, then cut the part to form the hole.
Use a jigsaw, radial or circular saw to cut everything from the outside to the inside. Remove any loose pieces or anything else that could disrupt the duct
Part 3 of 6: Installing the Tube Cover
Step 1. Push the cover inwards
Place the lid in the hole and push all the way through to see if the duct will be long enough to go through the hole you made.
- If it's not long enough, you'll need to buy a duct extension, which can be attached to the cover with screws and duct tape.
- Likewise, if the duct is too long, cut off the excess.
Step 2. Seal the hole
Remove the cover and place a seal around the hole where the end of the duct cover will go into the wall. This helps to seal better.
Step 3. Install the tube cap
Press the cover firmly into place and secure it with screws from the outside of the house.
Step 4. Seal around the lid
Put enough seal around the cap to completely seal the outlet.
Part 4 of 6: Assembling the exhaust fan
Step 1. Hold the wires
Go back to the kitchen and ask someone to help you lift the exhaust. Pull the wires from the wall through the hood wiring hole and secure them there with a cable clamp.
Step 2. Tighten the screws halfway
Put the hood in place and tighten the screws halfway through the cabinet you are using to secure the hood.
Push the exhaust upwards so that it connects with the piping
Step 3. Check the alignment
While the screws are semi-tight, check that the hood hole is perfectly aligned with the piping. If not, remove screws and adjust position of hood.
Step 4. Tighten the screws
Fasten the hood securely under the cabinets.
Part 5 of 6: Laying the Wiring
Step 1. Attach the black wires
Both the fan and the exhaust light must have a black wire. Join the wires to the black wire coming out of the wall, joining and twisting the ends so that they are snug.
- Cover exposed wires with a shield or electrical tape.
- If the wires are not exposed enough, strip the ends with pliers.
Step 2. Join the white strands
Repeat the process from step one with the white wires from the fan, light and wall.
Step 3. Join the ground wire
The ground wire in your house is probably green or copper. Attach it to the green ground screw and tighten it with a phillips screwdriver.
Part 6 of 6: Finishing Up
Step 1. Install shield, fan, lights and filter
Put wiring in place and replace shield. Following the instructions in the hood manual, put the fan and lamps, and also put the filter in its place.
Step 2. Turn on the power
Go to the circuit breakers and turn your house's power back on.
Step 3. Test
Turn on the lights and fan to make sure they work. You should also go outside with the exhaust running to make sure the air is flowing freely through the ducts.
Moist or greasy air that is not drawn in through the ducts can damage your walls
- When placing the ducts, make sure that they fit correctly, so that the hood works correctly.
- There are unpiped hoods, making installation easier, but these hoods are often worse as they just recirculate moist, smoky, and greasy air into your kitchen rather than out of the house. If you have to install one of these systems without a pipe, buy one with an activated carbon filter as it helps more in cleaning the air.
- When buying an exhaust fan, be sure to buy one that has a fan strong enough to clean the air in your kitchen, checking its flow rate. This rate indicates how much air the fan can pull in per minute. A good rule of thumb to remember is to buy an extractor fan with a flow rate that is at least twice the space in your kitchen.
- Remove shelves around work area.
- When dealing with brick or plaster walls, drill the holes with a masonry drill. Drill a series of holes next to each other from the outside, then use a chisel to remove from the wall.
- Wear a mask and goggles to avoid dust when installing the hood, so that you can avoid eye accidents and inhaling harmful particles.
- Pipe exhausts must be connected to a duct. Do not attempt to install one of these without a duct as you can cause serious problems for the exhaust fan and your home.
- If you don't already have an exhaust fan where you are installing yours, you may need the help of an electrician to locate the necessary wiring.