Bathroom exhaust fan installation in Southeast Michigan

If the mirror is still fogged twenty minutes after a shower, the fan in that room is not doing its job. Bathroom exhaust fan installation from Wright’s bathroom repair crew means a unit sized for the room, ducted in a short rigid run, and terminated outside the building rather than into your attic. The last part is where most existing installations go wrong, and it is the part that causes real damage.

The duct that ends in the attic

A surprising number of bathroom fans in Southeast Michigan houses vent into the attic space and stop there. Somebody installed the fan, ran flexible duct a few feet, and left it. Every shower then pushes warm wet air into a cold cavity, where it condenses on the underside of the roof deck.

In a Michigan winter that means frost forming on the sheathing, melting during a thaw and dripping into the insulation below. Homeowners find it as a stain on a bedroom ceiling and assume the roof is leaking. We check where the duct actually goes on every one of these jobs, because fixing the fan without fixing the termination solves nothing.

Sizing it for the room you actually have

Fan capacity is rated in cubic feet per minute, and the rule of thumb for a standard bathroom is roughly one unit of capacity per square foot of floor area, with a sensible minimum for a small room. A bathroom with a separate enclosed toilet or a large soaking tub wants more than the arithmetic suggests.

The more common failure is not an undersized fan but a correctly sized fan strangled by its ductwork. Long flexible runs, sharp turns and crushed sections cut real airflow to a fraction of the rating on the box. A smaller fan on a short straight rigid duct moves more air than a large one on a bad run.

Noise, and the reason nobody switches it on

Fan noise is rated in sones, and the difference between a loud unit and a quiet one is the difference between a fan that gets used and one nobody touches. An older fan roaring above the ceiling is functionally not installed, because the household has learned to leave it off.

Quiet units are inexpensive now and they change behavior. It is the least glamorous upgrade in a bathroom and one of the few that people notice every single day.

Some of the noise in an old installation is not the motor at all. A loose housing rattling against a joist, a duct clip that has come away, or a damper flap chattering in the wind all add to it, and all three are fixable without replacing anything. We listen before we assume the fan is the problem.

Running it long enough to matter

A fan switched off as somebody leaves the room has cleared a fraction of the moisture. The air is still saturated and the walls and grout are still wet. It needs to keep running well after the shower stops, and expecting anybody to remember that is optimistic.

A timer switch solves it in one part. A humidity sensing switch solves it better, because it runs the fan until the room is actually dry and then stops. Either is a small change with a large effect on how long the tile, the paint and the caulk joints in the room last.

What the installation covers

• A like for like swap into the existing housing where the duct and wiring are sound
• New housing framed in between joists where the old unit is the wrong size
• Rigid duct run on the shortest practical path, sealed and insulated in cold space
• Termination through a roof or wall cap with a working damper, flashed properly
• Timer or humidity sensing switch fitted in place of the existing switch

Where a licensed electrician takes over

Replacing a fan on the existing circuit, in the existing box, with the existing switch is our work. Adding a circuit, touching the panel, correcting an ungrounded two wire system or dealing with aluminum branch wiring goes to a licensed electrician.

A combination fan and heater unit generally draws considerably more than a fan alone and often needs a dedicated circuit. We will tell you that before you buy one rather than after we have opened the ceiling.

Fans with lights, heaters and everything else

Combination units put a fan, a light and sometimes a heater into one housing, which is appealing when there is only one opening in the ceiling. The tradeoff is that when any part of it fails, the whole assembly comes down. A separate quiet fan and a separate light last longer and cost less to fix.

Heater units are the ones worth thinking hardest about. A radiant heater above a shower is a real comfort in a Michigan February, and it is also the component that drives the electrical requirement. Where the existing circuit will not carry it, the cost of the heater is the cost of the circuit, and that changes the arithmetic.

Bathrooms with no fan at all

Older houses were built on the assumption that a window was ventilation, which works in July and does not work in January when nobody is opening it. A bathroom with an operable window and no fan is legal in many cases and still wrong in practice.

Putting a fan into a room that has never had one means cutting a housing in, running cable and creating a duct path to the outside. It is a bigger job than a swap and it is usually the single most effective thing you can do for a bathroom that grows mildew every winter.

What a working fan actually protects

Moisture is what ages a bathroom. Paint blisters and peels, grout stays damp and colonizes, caulk darkens, cabinet doors swell at the bottom edge, and drywall behind the tile stays wet long enough to soften. Every one of those is a repair somebody pays for later.

A room that dries out within half an hour of a shower keeps its finishes for years longer. That is the return on a fan and a timer switch, and it is why we raise ventilation on almost every bathroom job whether or not anybody asked about it.

When the fan is part of a larger list

• Regrouting a shower that keeps going dark in a room which never dries
• A first pass on a house you just bought, where the duct route is unknown
• Turnover work, since tenants will not run a fan they can hear from the hallway
• Inspection repairs, where a fan venting to the attic is routinely written up
• A wider lighting and ventilation plan when the room is being redone

Where we work across Southeast Michigan

We take these calls across Washtenaw, Wayne, Oakland, Macomb, Livingston and Monroe counties, including Ann Arbor, Canton and Ypsilanti, from our shop on Platt Road.

Get the moisture out of the room

Tell us how long the mirror stays fogged and whether anybody has ever looked at where the duct goes. View our Portfolio to see the bathrooms our crews build, or contact us now for a free quote.