Visual explainers

AHAM calculates room area by multiplying length by width.

Calculating room size is easy – simply multiply the length of the room by its width.

CADR indicates filtered-air volume delivered; AHAM lists separate tobacco-smoke, pollen and dust CADRs.

The AHAM seal (usually found on the back or the side of an air cleaner’s box) will list three clean air delivery rate (CADR) numbers – one for tobacco smoke, one for pollen and one for dust. The CADR indicates volume of filtered air delivered by an air cleaner. The higher the tobacco smoke, pollen and dust numbers, the faster the unit filters the air.

AHAM recommends tobacco-smoke CADR of at least two-thirds of room area; its 10 by 12 foot, 120 square foot example needs at least 80.

You’ll always want a unit with a tobacco smoke CADR at least 2/3 your room’s area. For example, a 10′ x 12′ room -120 square feet – would require an air cleaner with a tobacco smoke CADR of at least 80.

EPA labels the CADR unit in its portable-cleaner sizing table as cfm.

Minimum CADR (cfm)

AHAM Verifide suggested room sizes use 4.8 air changes per hour.

Look for the AHAM Verifide seal to find the suggested room size based on 4.8 air changes per hour, and reduction rates of tobacco smoke, dust and pollen (known as clean air delivery rates (CADR)).

AHAM advises a purifier specified for a larger room when ceilings exceed eight feet.

If you have ceilings higher than 8′, you’ll want an air cleaner rated for a larger room.

Ultrasonic humidifiers make cool mist using ultrasonic sound vibrations.

Ultrasonic , which create a cool mist by means of ultrasonic sound vibrations.

Ultrasonic or impeller humidifiers efficiently disperse tap-water minerals; white dust may appear on surfaces.

Researchers have documented that ultrasonic or impeller humidifiers are very efficient at dispersing minerals in tap water into the air. In addition, some consumers are bothered by a "white dust" that may appear on surfaces during use of these devices.

Evaporative humidifiers use a fan to blow air through a wet wick or other absorbent material, transmitting moisture invisibly.

Evaporative , which transmit moisture into the air invisibly by using a fan to blow air through a moistened absorbent material, such as a belt, wick, or filter.

EPA does not expect evaporative humidifiers to disperse substantial amounts of minerals.

Steam vaporizer and evaporative humidifiers are not expected to disperse substantial amounts of minerals.

EPA recommends low-mineral water such as distilled water to prevent releasing minerals.

Use water with low mineral content, such as distilled water, to prevent releasing minerals into the air.

EPA recommends bottled water labelled distilled; it still contains some minerals but likely less than most tap water.

Use bottled water labeled "distilled." While distilled water still contains some mineral content, it will likely contain lower mineral content than most tap water.

EPA advises emptying the tank, wiping surfaces dry and refilling portable humidifiers daily.

Empty the tank, wipe all surfaces dry, and refill the water in portable humidifiers daily to reduce any growth of microorganisms.

EPA advises cleaning portable humidifiers every third day.

Clean portable humidifiers every third day to reduce the buildup of scale and microorganisms.

Canopy nursery distances and cord routing.

Place the humidifier 3 to 4 feet away from your baby's crib and at least a foot away from the walls. This distance prevents the moist air from soaking walls, bedding, toys, and furniture, causing mold growth. To hydrate the entire room, place the humidifier in a central location that doesn't restrict airflow. Keep the unit secure in place to prevent it from tipping over or being knocked over by an excited pet or a curious, crawling baby. Make sure the device’s wires are well out of your baby’s reach and tucked away to avoid tripping hazards.

Canopy surface.

We recommend placing your humidifier on a clean, flat surface

Carepod One placement instructions.

Make sure the flat surface is at least two feet above the floor. This height allows for ideal mist circulation. Lastly, position your Carepod where it’s easy to access. Don’t forget to keep in mind: Avoid aiming the mist close to wooden furniture or sensitive materials, like artwork or electronics. Setting your Carepod up in a bedroom? If aiming mist towards the bed, place it at least three feet away. Or aim away towards the room for best circulation + comfort.

Carepod Mini placement instructions.

Make sure the flat surface is at least two feet above the floor. This height allows for ideal mist circulation. Lastly, position your Carepod where it’s easy to access. Don’t forget to keep in mind: Avoid aiming the mist close to wooden furniture or sensitive materials, like artwork or electronics. Setting your Carepod up in a bedroom? If aiming mist towards the bed, place it at least three feet away. Or aim away towards the room for best circulation + comfort.

Levoit surface and wall clearance.

4. Choose a hard, flat location for the humidifier at least 12 inches / 30 cm 2. Take the water tank off of the base and away from any walls. The surface remove all tape, including any tape on must be water-resistant. [Figure 1.3]

Levoit cord placement.

Place the humidifier and cord so • Do not cover the nozzle while that it will not be knocked over.

Levoit mist direction.

5. Mist should be directed away from walls, furniture, bedding, Figure 1.1 and appliances. [Figure 1.4]

Levoit child access.

Keep the humidifier out of reach it and contact Customer Support from children.

The National Weather Service defines relative humidity as a percentage ratio of actual moisture to the amount present at saturation.

A dimensionless ratio, expressed in percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated.

Relative humidity depends on both moisture content and temperature.

Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.

Airthings recommends placing View Plus at breathing height and at least three feet from vents, fans, windows or doors.

At breathing height, at least 3 feet from vents, fans, windows, or doors.

EPA recommends indoor relative humidity below sixty percent, ideally between thirty and fifty percent.

If possible, keep indoor humidity below 60 percent (ideally between 30 and 50 percent) relative humidity.

EPA says not to humidify above fifty percent indoor relative humidity.

Do not humidify to indoor relative humidity levels exceeding 50 percent.

If water condenses on windows, walls or pictures, EPA advises relocation, a lower humidistat setting or reduced humidifier use.

If water condenses on windows, walls, or pictures, relocate the humidifier, lower its humidistat setting, or reduce its use.

EPA says hygrometers can measure humidity levels.

Hygrometers, available at local hardware stores, may be used to measure humidity levels.

Ozlo describes passive noise cancellation and a silicone-tip seal through which some sound can still pass.

Our Sleepbuds® feature passive noise cancellation to block out snoring and other disruptions. In addition, we offer “noise masking” audio content (think, white noise, ocean waves, babbling brook, etc) to cover up and replace any sounds that bleed through the passive seal of the comfortable silicone tips.

Ozlo describes masking audio as covering and replacing sound that bleeds through the silicone-tip seal.

In addition, we offer “noise masking” audio content (think, white noise, ocean waves, babbling brook, etc) to cover up and replace any sounds that bleed through the passive seal of the comfortable silicone tips.

Sony explains that noise cancellation generates antiphase sound against surrounding noise.

The noise canceling function generates antiphase sound against outside surrounding noises (such as noises in vehicles or noises from air conditioners indoors) to cancel out surrounding noises.

Sony identifies microphones on its headset units and warns that covering them affects noise cancellation.

Do not cover the microphones on the left and right units of the headset with your hands. If they are covered, the effect of noise canceling function or Ambient Sound Mode may not perform properly, or a beeping sound (feedback) may occur.

Sony says cancellation primarily works on low-frequency vehicle and air-conditioning noise and does not completely cancel noise.

The noise canceling function works primarily on noise in the low frequency band such as vehicles and air conditioning. Although noise is reduced, it is not completely canceled.

The single Original filter page names Core 300-P-RF.

1 Pack x Core 300-P-RF Original Filter

The Original two-pack names both US purifier models as compatible.

Genuine Replacement Filter for Core 300-P / 300S-P

The Original two-pack names its cartridges Core 300-RF.

2 Pack x Levoit Core 300-RF Original Filter

The US 300S-series manual lists Core 300-P-RF as the Original filter.

Core 300-P-RF

A phone connection is required for initial setup and streaming; configured built-in Sleep Sounds can play without it.

While a phone and an active bluetooth connection are necessary to initially set up and to stream audio, your Sleepbuds® can be configured to automatically play your built-in Sleep Sound as soon as you take them out of the case. No phone or bluetooth connection required.

The Smart Case is the Sleepbuds 2 communication hub; Ozlo recommends keeping it nearby when streaming.

For the best possible streaming experience, we still recommend keeping the Smart Case nearby, such as on your nightstand while you sleep. The Smart Case acts as the communication hub for Sleepbuds, helping maintain a stable connection and ensuring the most reliable streaming performance throughout the night.

Simple Mode uses a Sleep Sound stored on the buds and turns Bluetooth streaming off.

Your Sleep Sound plays immediately from memory stored directly on your Sleepbuds. Bluetooth streaming turns off for a simpler, lower-power sleep experience.

LectroFan Micro2: The maker lists 2 x 2 in. The largest stated dimension is 2 in.

2" x 2" (51mm x 51mm)

Yogasleep Hushh 2: The maker lists 1.3 x 3.4 x 4 in. The largest stated dimension is 4 in.

Dimensions: 1.3 in x 3.4 in x 4 in

SNOOZ Go 2: The maker lists 3.8 x 3.8 x 1.7 in. The largest stated dimension is 3.8 in.

Dimensions (L x W x H): 3.8 in x 3.8 in x 1.7 in

LectroFan Alpha: The maker lists 1.8 x 4 x 3.8 in. The largest stated dimension is 4 in.

Product Dimensions 1.8 x 4 x 3.8 inches

Manta SOUND's headphones and battery must be removed and are damp-wipe only.

Remove the headphones and battery unit through the convenient access point — which snap in and out easily using magnets. These parts are not machine washable and should only be wiped with a damp cloth.

Manta recommends cold machine washing the eye cups and strap in a mesh bag, then air drying flat.

The eye cups and the head strap are machine washable. We recommend putting these parts in a mesh laundry bag and putting in the washer. Wash with cold water. Once washed, air dry these parts by laying them flat.

ATIS defines white noise as having equal power per hertz over the specified frequency band.

White noise has equal power per hertz over the specified frequency band.

IEEE describes white noise as having flat power spectral density.

White noise has a flat power spectral density across all frequencies, making it the reference case.

ATIS defines acoustic pink noise as having equal power per octave.

In acoustics, noise in which there is equal power per octave.

IEEE says pink-noise power spectral density falls by three decibels per octave as frequency increases.

Pink noise, also called 1/f noise, has a power spectral density that decreases by 3 dB per octave as frequency increases, so that equal-width logarithmic frequency bands carry equal power.

IEEE says brown-noise power spectral density falls by six decibels per octave and is proportional to inverse frequency squared.

Brown noise, derived from Brownian motion, has a power spectral density that falls by 6 dB per octave, proportional to 1/f².

Lumie Bodyclock Shine 300 offers a sunrise and sunset lasting 15 to 90 minutes.

15-90 minute sunrise/sunset duration, 15 sounds, FM radio, tap-control snooze, choice of light intensity, daily/weekly alarm and more.

The Philips SmartSleep HF3520/60 leaflet specifies an adjustable sunrise-simulating process of 20 to 40 minutes.

Sunrise simulating process: adjustable 20-40 Power Output Adapter: 12W Display brightness control: Self adjusting minutes

Loftie says its Clock is not a sunrise alarm, but its night light can turn on with alarms.

The Loftie Clock is not a sunrise alarm. However, the night light of the clock can be set to turn on with your alarms.

Lumie identifies this model as the Bodyclock Shine 300.

Lumie® Bodyclock Shine 300 Wake-up Light Radio Alarm Clock

The Philips SmartSleep leaflet identifies the Wake-up Light as HF3520/60.

Wake-up Light HF3520/60