Fan and Housing
We supply a correctly sized fan rated at 110 to 150 CFM, usually under 1.0 sones. Brands include Delta and Broan, and we show you the rating before install so there is no surprise about noise.
Quiet, code-correct bathroom ventilation for Bannock County homes.
Exhaust Fan Installation Pocatello ID That Stops Bathroom Moisture
Exhaust fan installation Pocatello ID homeowners can count on starts with the right size fan and a vent that actually exits the house. We handle bathroom fan install Pocatello Idaho for older homes near Old Town, rentals by the University Area, and remodels out toward Highland. If your mirror fogs for 20 minutes after a shower, your fan is undersized, clogged, or venting into the attic. We fix all three.
Careful work. Honest options.
About this service
What Exhaust Fan Installation Pocatello ID Really Involves
Exhaust fan installation Pocatello ID is the removal of your old fan and the fitting of a correctly sized, properly ducted unit that pulls humid air out of the bathroom and pushes it outdoors. That means cutting a clean ceiling opening, running rigid or insulated flex duct to a wall or roof cap, wiring the fan to a switch or humidity sensor, and sealing every joint so attic air never leaks back in. A 110 CFM fan is the floor for most bathrooms; we size by cubic feet, not guesswork.
Pocatello homes built before 1980 often have fans that dump moist air straight into the attic or crawlspace. In our cold winters, that moisture condenses on roof sheathing and freezes, then thaws into stains and mold by spring. We see it constantly in the older housing stock around Old Town and Pocatello Heights. If you have been searching for a Pocatello exhaust fan contractor who actually checks where the duct terminates, that is the first thing we verify on every call.
- ✓ Stops Mold and Mildew
- ✓ Quiets a Noisy Fan
- ✓ Protects Paint and Cabinets
- ✓ Cuts Energy Waste
What's included
What Our Exhaust Fan Installation Includes
Every job includes the fan, the duct work, the termination, and the test. Here is what is standard on a BathFlow Remodeling install and what we quote separately.
New Duct Run
We replace crushed or disconnected flex duct with insulated duct sized to the fan, sealed at every joint with foil tape and mastic. Runs through cold attic sections get extra insulation to prevent condensation.
Roof or Wall Termination
The duct exits through a proper cap with a backdraft damper, flashed and sealed against Bannock County weather. This is the step that separates a real install from a fan that just moves air into the attic.
Electrical Connection
We wire the fan to your existing switch or install a humidity-sensing control. Work is done under our State of Idaho Electrical License, and we test the circuit before closing up.
Airflow Verification
We confirm pull at the grille and check the run for leaks before we leave. You get a short walkthrough of the switch, the sensor, and how to clean the grille every few months.
How it works
Our Exhaust Fan Installation Process
We ask four questions: bathroom size, ceiling height, current fan brand, and whether the duct exits the roof or a wall. That tells us the CFM range and whether we need a roof cap or wall vent kit on the truck. Most calls take five minutes and end with a same-week appointment window.
On arrival we climb into the attic or crawlspace first. We check where the old duct terminates, look for crushed flex line, disconnected joints, and moisture staining on the sheathing. This 10-minute inspection is why our exhaust fan installation Pocatello ID jobs do not come back with the same problem in two years.
We measure the room in cubic feet and pick a fan rated for at least 1 CFM per square foot, usually 110 to 150 CFM. Using a stud finder and laser level, we mark the opening, cut clean drywall, and frame the housing so the grille sits flush. A 4-inch or 6-inch duct run follows, insulated in cold attic sections.
We tie the fan into the existing switch leg or install a humidity-sensing control, then terminate the duct at a proper roof or wall cap with a backdraft damper. Every joint gets foil tape and mastic, not just a zip tie. This is where cheap installs fail and where our work holds.
We hold a tissue to the grille to confirm pull, then check with a handheld anemometer where access allows. The old fan and drywall dust leave with us. Most single-fan jobs run two to four hours, and you get a walkthrough of the switch and filter before we pull out of the driveway.
STEP 01Phone Assessment
We ask four questions: bathroom size, ceiling height, current fan brand, and whether the duct exits the roof or a wall. That tells us the CFM range and whether we need a roof cap or wall vent kit on the truck. Most calls take five minutes and end with a same-week appointment window.
Tools & methods
Tools and Methods We Use
Oscillating multi-tool
Cuts clean ceiling openings around joists and existing framing without cracking surrounding drywall. It is the difference between a tidy patch and a jagged hole.
Stud finder and laser level
Locates joists and keeps the fan housing square to the room. A level grille looks intentional; a crooked one looks like a rushed install.
Moisture meter
Checks ceiling and framing for hidden moisture before and after install. If the meter reads high, we know the old fan has been failing for a while.
Caulking gun
Applies silicone caulk and mastic at duct joints and the exterior cap. Sealed joints keep attic air out of the bathroom and bathroom air out of the attic.
Anemometer
Measures actual airflow at the grille so we confirm the fan is moving the CFM it is rated for after the duct run is complete.
Real results
Before and after.
Exhaust Fan Installation
Old Town Attic-Venting Fan Replaced
A 1948 home near Old Town had a 50 CFM fan dumping humid air straight into the attic. Roof sheathing showed frost every winter and brown stains had started on the bathroom ceiling.
After: We installed a 110 CFM fan, ran insulated duct to a new roof cap, and sealed every joint. Attic moisture readings dropped from 72% to 48% within two weeks, and the ceiling stains stopped spreading.
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Exhaust Fan Installation
Highland Master Bath Quiet Upgrade
A 1990s master bath in the Highland Area had a 4.5-sone fan that rattled the light fixture. The mirror stayed fogged for 25 minutes after showers and the homeowner had stopped running the fan entirely.
After: We replaced it with a 150 CFM unit rated at 0.8 sones and added a humidity sensor. The mirror now clears in under 5 minutes and the fan runs itself until the room drops below 55% humidity.
Book this service → Exhaust Fan Installation
University Rental Fan Swap
A four-plex near the University Area had three dead fans and one that only ran on high. Tenants reported mildew on the shower caulk and a persistent damp smell in two units.
After: We replaced all four fans with 110 CFM units and installed new duct terminations at the wall. Caulk mildew stopped recurring within a month, and the landlord has had zero ventilation complaints since.
Book this service → Problems we solve
Bathroom Fan Problems We Solve in Pocatello
Most fan calls come down to four issues. Here is what we find and how we fix it without tearing your bathroom apart.
Ask a pro →Fan vents into the attic instead of outside
We extend the duct to a proper roof or wall cap with a backdraft damper, insulate the run, and seal every joint. This is the single most common fix on older Pocatello homes and the one that stops the damage cycle.
Fan is too small for the bathroom
We measure the room, calculate required CFM, and install a unit rated for the space, usually 110 to 150 CFM. If the duct is undersized for the new fan, we upsize it in the same visit.
Grinding or rattling fan motor
We replace the motor and blade assembly or the whole fan, depending on age and parts availability. New units run under 1.0 sones, so the room is quiet and the air actually moves.
No fan at all in an older bathroom
We cut a new ceiling opening, frame the housing, run duct to an exterior cap, and wire a switch or sensor. Most installs finish in a single day with a clean, painted patch around the grille.
Proof you can check
Licensed, Insured, and Local
- State of Idaho Electrical License · State of Idaho Division of Occupational and Professional Licenses
- State of Idaho Plumbing License · State of Idaho Division of Occupational and Professional Licenses
- EPA Lead-Safe Certified Firm · U.S. Environmental Protection Agency
- OSHA 10 · Occupational Safety and Health Administration
- TCNA Tile Installation Certification · Tile Council of North America
Most single-fan installs run $325 to $750 in 2026, including the fan, duct work, and a new roof or wall cap. A straight swap with existing duct at the right size lands near the low end. Adding a new roof penetration, running duct through a finished ceiling, or upgrading to a humidity-sensing fan pushes toward the top. We quote the full job before we start.
A grinding or rattling fan usually means worn motor bearings, a bent blade, or debris caught in the housing. Fans in Pocatello attics also collect dust and insulation fibers that throw the blade off balance. If the noise started after a cold snap, the duct may have separated and the fan is pulling against a blocked run. Replacement is usually cheaper than a motor swap on a builder-grade unit.
A standard replacement takes two to four hours. That covers attic inspection, cut-out, new duct, wiring, and airflow testing. Jobs that add a new roof penetration or run duct through a finished second-floor ceiling can stretch to a full day. We tell you the window when we book, and we do not leave a ceiling open overnight.
You need at least 1 CFM per square foot of floor area, with a 110 CFM minimum for most bathrooms. A 5-by-8 bath at 40 square feet gets a 50 CFM fan by code, but we install 110 CFM because real-world duct resistance cuts effective airflow. Add 50 CFM for a jetted tub or a bathroom over 100 square feet. We measure before we order.
Ready when you are
Book Exhaust Fan Installation Pocatello ID This Week
One call gets you a sized fan, a proper duct run, and a clean ceiling. We are licensed, insured, and we answer the phone at +1 986-336-9053. Same-week scheduling for most Pocatello addresses.
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Request an appointment
Contact our Pocatello bathroom crew
Call us or send a message and we will get back to you the same business day. We schedule estimates Monday through Friday and can usually get to a Pocatello address within a few days. Tell us what is going on with the bathroom and we will tell you what it takes to fix it.