Vent Hood Repair

Most vent hood calls are not motor failures. A hood that has stopped clearing the kitchen is usually telling you that its grease filters are saturated, that the duct behind it has never been cleaned, or that a ductless model is running on a charcoal filter that expired a year ago. Those are the first three things we check, and on a good share of visits they are the whole answer. The diagnostic is $99 and is waived when you approve the repair, every job carries a 90-day parts-and-labour warranty, and we work nine metro areas. Florida and general (863) 474-2970, Texas (281) 205-1474, Georgia (470) 412-9335.

Ducted or ductless? The answer changes what can be fixed

Before anything else, establish which kind of hood you have, because the two fail differently and one of them cannot do what people expect of it.

A ducted hood pushes air through a duct to the outside of the building. It removes heat, moisture, smoke and odour, because all of it leaves the house. When one underperforms, the duct is part of the diagnosis.

A recirculating or ductless hood has no duct at all. It draws air through a grease filter, then through a charcoal filter, and blows it back into the room. It never removes heat or moisture, only some odour, and only while the charcoal is fresh. That charcoal is a consumable that is replaced, never washed, and a household that has never replaced it has a hood that is moving air and cleaning almost nothing.

People convert kitchens and forget which they have. If there is no visible duct above the hood and no cap outside the wall or roof, it is recirculating, and the fix for poor odour control is a filter rather than a technician.

Filters: the single most common cause

The metal filters across the underside of the hood are doing the real work, and they are consumables in the sense that they demand cleaning, not replacing.

Mesh filters are layered aluminium and they clog thoroughly, because grease sets inside the mesh where you cannot see it. A mesh filter can look acceptable and still be passing a fraction of its rated airflow.

Baffle filters are the overlapping steel channels found on professional-style hoods. They separate grease by making the air change direction, they clean far better, and they tolerate a dishwasher.

Clean them monthly in a household that cooks daily, and more often if you fry. Hot water with degreasing detergent, or a dishwasher cycle for baffles and most mesh filters, though check the manual first because some anodised finishes discolour. The test that matters: hold a cleaned filter up to a light. If you cannot see light through it evenly, it is still blocked.

The reason this section comes before the mechanical ones is simple. A saturated filter reduces extraction, makes the blower work against resistance, and eventually lets grease past into the duct and the fan housing, which turns a ten-minute cleaning job into a much larger one.

The duct behind the hood

On a ducted hood, everything downstream of the filters matters and none of it is visible.

Duct runs follow the same physics as a dryer vent: length costs airflow and every elbow costs more. A hood on an interior island wall, ducted up through a ceiling and out through a roof, can be at the limit of what its blower was rated for before anything is wrong with it. If a hood has always been weak rather than having become weak, suspect the route rather than the appliance.

Then there is the damper. There is a backdraft damper, a flap that opens when the fan runs and falls shut when it stops so outside air does not come back in. A flap stuck shut chokes extraction completely while the fan sounds perfectly normal, and a flap stuck open lets cold or humid outside air into the kitchen and rattles in the wind. Both are ordinary and inexpensive to correct once identified.

Finally the termination outside: a wall or roof cap that has filled with grease-laden lint, been painted over, or been taken over by a bird nest in spring. That is the same failure that closes dryer hoods, and it is worth looking at from outside twice a year.

Makeup air, and hoods that seem too strong

A powerful hood in a well-sealed modern house can run into a problem that surprises people: there is not enough replacement air for it to pull.

Air removed from a kitchen has to be replaced from somewhere. In an older leaky house it simply comes in around windows and doors. In a tightly built one it may not, and the hood then works against a partial vacuum, which shows up as far less extraction than the specification suggests, doors that are harder to open, and in the worst case combustion appliances that do not vent as they should.

That last point is a safety matter rather than an appliance fault, and it is why high-output hoods are often required to be paired with a makeup air supply. If your hood underperforms only when the house is shut up, and the filters and duct are clear, this is the direction to look.

Noise, lights and controls

A rattle that comes and goes is usually the damper flapping or a filter not seated in its clips, and both are free to correct. A steady whine or grinding that rises and falls with fan speed is blower bearings, which is a genuine motor repair. A hum with no air movement means the motor is being told to run and cannot, and on multi-speed hoods a fan that works on one speed but not another points at the switch or the board rather than the motor.

Lights fail more often than anything electronic behind them. On older hoods the heat cycling degrades the lamp socket rather than the bulb, which is why fitting a fresh bulb sometimes changes nothing. Where a hood has been converted to LED, a driver or a dimming module is the next suspect.

Controls are a short list: a membrane panel that has stopped registering presses, a rotary or rocker switch that has worn, or the control board. On a hood integrated with other equipment, an over-the-range microwave especially, the fan and lights are driven by the same board that runs the microwave, so a fan fault can be a microwave fault and is diagnosed as one. That equipment is covered on our microwave repair page.

Downdraft systems are a different animal

Some kitchens have no overhead hood at all and instead use a downdraft that rises from behind or beside the cooktop, or vents through the cooktop itself. Those are a system rather than an appliance: a motorised vent, a blower that often sits remotely, and ducting routed under the floor or through a cabinet run.

They fail at the lift mechanism, the blower, the switch and the duct, and their ducting collects grease over years in a way that is easy to ignore because none of it is visible. If a downdraft that used to work has quietly stopped pulling, look at the filters and the duct before the motor. Replacement is a much bigger job than for an overhead hood, because the cut-out, the blower position and the duct connection all have to match, which usually makes repair the better answer. Related work is on our cooktop repair and range repair pages.

What it costs, and why there is no price table here

We publish price ranges on this site wherever we have real published figures behind them, and for vent hoods we do not. Hoods vary far more than other appliances: a basic under-cabinet unit and a professional island hood with a remote blower are different machines with different parts at different prices, and quoting a single range would be inventing a number.

What we can say plainly is the shape of it. Filter cleaning, damper correction, a lamp or socket, a switch and duct clearing sit at the low end and are frequently the whole job. A control board or a blower motor is the substantial repair. The $99 diagnostic is waived when you approve the work, we quote the complete job before starting, and where a part has to be ordered we give you the timescale with the quote rather than afterwards.

Repair or replace

Hoods are mechanically simple and long-lived, so repair usually wins. Motors, switches, boards, lamps, sockets and dampers are all ordinary parts, and the body of a hood does not wear out.

The cases where replacement makes more sense are narrow: a blower motor on a very old builder-grade hood where the part costs most of a new unit, a hood whose part is genuinely no longer made, and a recirculating hood in a kitchen where the household actually wants extraction, in which case the answer is ducting rather than a repair.

Built-in inserts and liners inside custom cabinetry are the opposite case. There the surround was built to the unit, so replacement means joinery, and repairs that would be marginal on a freestanding hood are clearly worth doing.

Ducting decides the life of laundry equipment the same way it decides a hood: how long dryers last puts numbers on it, including the five-year published life of flexible plastic duct.

Frequently asked questions