Bathroom Extractor Fans That Clear Steam and Stop Mildew

The mirror stays fogged for twenty minutes after a shower, the paint near the ceiling is starting to freckle, and a faint musty smell greets you every morning. Those are the classic signs of a bathroom exhaust fan that is too weak, too old, or too loud to be used. Replacing it is one of the most practical small upgrades in a home, because moisture left in a closed room feeds mildew and slowly damages drywall and trim.

This guide looks at five widely sold ceiling-mounted ventilation fans from Panasonic, Broan-NuTone, and Delta, and explains what to check before you buy. Airflow, noise, and ducting matter far more than appearance, so the sections below start with the numbers worth comparing. Model details differ between production runs, so verify the current specifications on the product page.

Quick Picks

All five are ceiling-mounted ventilation fans meant to replace or serve as an exhaust fan, and none of the names states airflow or noise. Use the table to shortlist by brand line, then compare the CFM and sone figures on each product page against the guidelines that follow.

How to Choose

Most buyers spend too much time on brand and too little on the four numbers and details below. Settle airflow, noise, ductwork, and controls first, and the brand decision becomes simple.

Size the airflow to the room

Ceiling height and fixtures change the math slightly. For ceilings above 8 feet, add about 10 percent to the CFM figure, and add 50 CFM for each toilet, shower, and bathtub if the room is larger than 100 square feet. As of 2026, the common retrofit range in the US runs from about 50 to 110 CFM, which covers most hall baths and primary bathrooms.The usual rule of thumb is 1 cubic foot per minute (CFM) per square foot of floor area for bathrooms up to about 100 square feet. A 50 square foot bath needs roughly 50 CFM, a 70 square foot bath about 70 CFM. Larger bathrooms and those with a separate shower or soaking tub benefit from a higher rating or more than one fan.

Check the sone rating

A useful comparison is that 1 sone is roughly the sound of a quiet refrigerator, and 4 sones is about the level of a busy kitchen. Remember that a fan in a bathroom with hard tile surfaces sounds louder than the same fan in a carpeted room, so leave a little margin. If the fan is the only thing you hear at 6 a.m., it will not get used.Sones measure loudness, and lower is quieter. Fans rated at 1.0 sone or below are close to whisper-quiet, while anything above about 3.0 sones is clearly audible. A fan that annoys you will get switched off, so noise is as important as airflow.

Match the duct size and run

Rated airflow is measured under ideal lab pressure, and real homes lose some of it to bends and length. As a rough guide, every 90 degree elbow behaves like several extra feet of straight duct. Rigid metal duct moves air better than flexible foil, so use it for runs longer than about 10 feet, and finish at a proper roof or wall cap with a damper to block drafts.Most bathroom fans connect to 4 inch or 6 inch duct. A long, bent, or undersized duct cuts real airflow substantially, so keep the run short, straight, and insulated if it passes through an unheated attic. Vent to the outdoors, never into the attic itself.

Look for useful controls and certifications

Controls are where a decent fan becomes a convenient one. A motion sensor starts the fan when you walk in, a humidity sensor keeps it going after you leave, and a countdown timer is the minimum worth having. If you rarely remember to switch the fan off, a sensor model can pay for itself in lower moisture damage and fewer repaint jobs.A humidity sensor or a timer helps because the fan runs until the moisture is gone, not until you remember to turn it off. Look for the Home Ventilating Institute (HVI) certification, which means the airflow and sound ratings were measured to a standard, and ENERGY STAR labeling if you plan to run the fan often.

Our Picks Reviewed

Panasonic WhisperCeiling FV-0511VQ1

The WhisperCeiling name places this in Panasonic’s quiet ceiling-fan line, which is built around low-noise operation for rooms where people care about sound.

• Pro: a quiet-focused series is easier to live with, so people tend to use it for long ventilation cycles.
• Pro: a major brand with a long record in residential ventilation offers wide availability and replacement info.
• Con: premium quiet fans generally cost more than basic builder fans.

Skip it if you only need a basic exhaust for a rarely used guest bath, where a plain fan is enough.

Panasonic WhisperFit FV-0510VF2

WhisperFit is Panasonic’s retrofit-friendly line, and the model number suggests a flexible-airflow design in the same brand family as the WhisperCeiling.

• Pro: a “fit” line is aimed at replacing an existing unit without major ceiling changes.
• Pro: the Panasonic name carries the brand’s focus on low noise.
• Con: the name alone does not state airflow, so check the CFM on the page against your room size.

Skip it if your bathroom is very large and you have already calculated that it needs a heavy-duty fan with a higher rating.

Broan-NuTone 678 Ventilation Fan

Broan-NuTone is one of the most recognized ventilation names in US homes. The 678 is a plain ventilation fan with no heater or light in the name.

• Pro: a standard fan from a mainstream brand is easy to find and replace.
• Pro: a no-extras design keeps the product simple and focused on moving air.
• Con: without a stated sone or CFM in the name, you need to confirm noise and airflow before buying.

Skip it if you want integrated lighting, a built-in heater, or smart humidity control.

Broan-NuTone 688 Ventilation Fan

The 688 sits right next to the 678 in Broan’s numbering, so it is worth comparing the two on the product pages for airflow and sound ratings.

• Pro: same trusted brand and straightforward ventilation focus.
• Pro: a close sibling model makes side-by-side comparison easy.
• Con: the numbers in the name tell you nothing about CFM, so rely on the spec sheet.

Skip it if you have already chosen a quieter premium line and do not want to compromise on noise.

Delta Breez GBR80

Delta Breez is a ventilation line from Delta Electronics, and GBR is part of a builder-oriented series used in many new-construction and remodel projects.

• Pro: a series aimed at builders often means practical, standard mounting.
• Pro: a different brand gives you another option if local stores stock it.
• Con: the model name does not state the key numbers, so read the airflow rating before purchase.

Skip it if you want a retrofit line designed specifically for tight replacement jobs.

Which One Fits

The right pick depends on how the bathroom is used and what is already in the ceiling. A family bath that sees back-to-back showers needs a different fan than a powder room, and a swap into an existing cutout is a different job from a new installation.

• You hate fan noise: Panasonic WhisperCeiling FV-0511VQ1.
• Swapping an old unit with little ceiling work: Panasonic WhisperFit FV-0510VF2.
• Simple replacement in a standard bath: Broan-NuTone 678 Ventilation Fan or Broan-NuTone 688 Ventilation Fan.
• Remodel or new build with a builder-style series: Delta Breez GBR80.

Cold climates often pair ventilation with warmth, so see our roundup of the bathroom fan heater combo options, and if moisture persists beyond the bathroom a budget dehumidifier can help in adjoining rooms.

Common Mistakes

These errors are common in both do-it-yourself jobs and rushed contractor installs, and each one quietly reduces how well the fan clears moisture.

• Buying on CFM alone and ignoring the sone rating.
• Venting into the attic instead of through a duct to the outdoors.
• Using narrow, kinked, or very long ductwork that strangles airflow.
• Switching the fan off the moment the shower ends instead of running it another 20 minutes.
• Skipping the cleaning, since dust on the grille quickly reduces real airflow.

FAQ

How long should the fan run after a shower?

About 20 minutes is a good rule of thumb. A timer or humidity sensor removes the need to remember. If the mirror is still fogged after that, the fan is probably undersized or the duct is restricted, and that is worth investigating before mildew shows up on the ceiling.

Can I replace a fan myself?

Straight swaps are doable for handy owners, but wiring and attic work call for care. Hire an electrician if you are unsure. Always shut off the breaker, confirm the wires are dead with a tester, and follow the housing’s clearance notes for insulation and ceiling joists.

How often should I clean it?

Remove the grille and vacuum or wipe the housing every few months. Dust is a leading cause of weak airflow.

Do I need a fan if the bathroom has a window?

A window helps in warm weather but is unreliable in winter. Most building codes still favor a mechanical fan. A window also lets cold air in during the season when condensation is worst, so a fan that quietly pulls moist air out is more dependable than hoping a sash stays cracked open.

Is a more powerful fan always better?

No. An oversized fan can be loud and waste conditioned air, so match the rating to room size. Very strong fans can also pull combustion gases back down a flue if the home has a gas appliance, so makeup air matters in tightly sealed houses.