Installing A Range Hood

Installing a range hood details and information that will help aid you on this basic carpentry project. Hoods come in two styles. ducted and ductless. After passing the air through a filter to remove grease and odors, a ductless hood pushes the air back into the room. The filter must be changed quite often, and the hood does not re­move heat or moisture.

A ducted hood removes the heated air from the room. Plan as short and straight a path as possible for the duct­ing, in order to ease its installation and to get the best performance from the hood. Always vent ductwork to the out­side of your home. Never vent into an attic or unused house space: the re­sulting grease buildup creates both fire and health hazards.

INSTALLING A RANGE HOOD Step 1: Removing an Old Hood

Before installing a range hood you want to remove the old one and this is how. A range hood is fairly large and heavy so work with a helper. Before removing the existing hood. turn off the power to the circuit that feeds the hood. The wir­ing is usually housed in a junction box behind a metal pan covering. Loosen the terminal screws and remove the wires. Separate the cable wires and completely wrap each wire end with electrical tape.

INSTALLING RANGE HOOD Step 2: Choosing the Ductwork

Ductwork comes in pieces of several sizes and shapes to accommodate a variety of pathways. Either wall or roof caps finish off the outside openings. To prevent fire hazards. purchase metal rather than plastic ducting.

You can purchase either standard sheet metal duct or flexible metal duct. Flexible duct is quite easily dented or crushed. more so than conventional ducting. On the other hand, it is light and goes around corners without re­quiring elbows or other adapters.

Since flexible ducting is available only in round shape. When installing a range hood you must install a rectangular-to-round converter to con­nect the hood to the duct.

Step 3: Connecting Up to the Old Ductwork

If the duct opening in the new hood is in the same position as (or similar to) the duct opening already in existence. your task is simple. If the two do notmatch, try to use two pieces of elbow ducting to angle the channel over to the old vent. Then patch the old cabi­net opening. If this procedure is not feasible. abandon the old duct and in­stall an entirely new run.

Sometimes new ducting is the best course, especially if the old duct is too grease-laden for safe use. To deal with the old duct. you must

(1) remove the old duct work and patch the holes that remain, or screw down the damper in the exterior wall and caulk it closed securely: then fill the duct with insulation and repair only the cabinet or wall opening.

Step 4: Laying Out the Duct Path

A duct's pathway depends upon your home's construction and hood's loca­tion. If the stove sits against an exterior wall, the shortest path is straight out through the back of the hood. Be sure that the damper in the hood's duct and the one in the wall cap cannot interfere with each other. If they do. remove the hood damper.

Another satisfactory path utilizes a short vertical pipe from the top of the hood and then angles out through the wall. In most homes, this duct path travels up through the cabinet or soffit above the hood. rather than through the insulation between the kitchen wall and the exterior shell.If the hood is on an interior wall, you must avoid extremely lengthy and twisted paths. Go straight up through the wall space to the roof, if possible. If you cannot. pass the ducting through the soffit to an outside wall.

Step 5: Inserting the Duct

Although the primary purpose of a duct is to provide a passage for exhaust fumes and residue. it can also providea passage for the flames of a grease fire. To be certain that any fire is en­closed in the metal ducting. as you connect sections together. tape the joints very securely with duct tape.

Cutting an Opening. First, cut the opening in the exterior of the house with a sabre saw. a keyhole saw, or a reciprocating saw. This opening should be slightly larger than the duct­ing. (If local codes require, install casing strips around a wall opening in a wood house.)

Inserting the Ducts. To install a straight path, tape one section to the next, one at a time, and lower the duct from above. If your path has a center angle. insert the section from the out­side. Then push the vertical section to meet it. If you do not have access to the junction of the sections, cut a small access hole and tape the junction as securely as all other joints.

Step 6: Capping and Sealing The Duct 

If the duct comes through an exterior wall. trim the duct even with the siding and install a wall cap according to instructions. Fasten the wall cap to the duct to the wall and caulk the opening well.

If the duct comes through the roof, it should extend at least 3/4 inch above the high side of the roof. Using plastic roof cement. completely seal the open­ing between the duct and the roof. Use a lot of sealant, to prevent later water seepage. Then insert the high-side edge of the roof cap under the shingles and apply plastic roof cement all around the cap.

Step 7: Making The Final Hookup in Installing A Range Hood

the power must be off to make this connection. Fish cable to the hood. Fasten the cable to the hood with the connecter locknut. Use wire nuts to splice the black cable wire to the black hood wire. Do the same with all white wires. Finally, using the green ground screw. attach the cable ground wire to the grounding bracket built into the hood. Comply with all local codes (reg­ulations may vary). Replace the wiring box cover and screws. Be careful not to pinch any of the wires. Thanks for reading this page on installing a range hood for a kitchen I hope that some of this basic carpentry information was beneficial for you thank you.