PureAirIndex · Bedroom sizing

What size air purifier do I need for a bedroom?

For a 150 ft² bedroom with an 8-ft ceiling, a 4.8 equivalent-air-change target requires 96 cfm smoke CADR. A 9-ft ceiling raises that requirement to 108 cfm.

Required smoke CADR = floor area × ceiling height × target eACH ÷ 60. This is a particle-filtration sizing estimate, not fresh-air ventilation or a guarantee of health outcomes. We analyze certification data; we have not personally tested these purifiers.

ENERGY STAR snapshot · Captured 2026-10-20 UTC · 247 certification records

Your bedroom’s CADR

Floor area (ft²)Ceiling height (ft)Target eACH

eACH means equivalent air changes per hour from filtration. The default 4.8 is a comparison benchmark, not a medical recommendation. Account for connected spaces when doors remain open.

Required smoke CADR

96 cfm

200 of 247 certification records meet your target.

Display rounds up; matching uses the unrounded requirement. Records may include different certifications for the same product family.

Certified-output sizing matches

Up to four matches with verified positive efficiency and derived watts, highest smoke CADR per watt first. Not a ranking of sleep comfort, price or product quality.

Rainbow Luggable XL Ultra

Luggable XL Ultra · Certification ID 4020923

Certified smoke CADR: 333 cfm
Certified efficiency: 23.96 cfm/W
Derived operating watts: 13.9 W
8 h/day electricity scenario: $6.49/yr

Why it matches: its 333 cfm delivers approximately 16.65 eACH in your 150 ft² × 8 ft room, meeting your 4.8 target at the listed output. Its certified efficiency places it among the first four eligible matches under our efficiency sort.

Quieter-speed performance and noise are unknown here. Electricity uses derived operating watts × 8 h/day × 365 at $0.16/kWh; filters and purchase price are excluded.

Rainbow Luggable XXL

Luggable XXL · Certification ID 4020924

Certified smoke CADR: 306 cfm
Certified efficiency: 23.91 cfm/W
Derived operating watts: 12.8 W
8 h/day electricity scenario: $5.98/yr

Why it matches: its 306 cfm delivers approximately 15.30 eACH in your 150 ft² × 8 ft room, meeting your 4.8 target at the listed output. Its certified efficiency places it among the first four eligible matches under our efficiency sort.

Quieter-speed performance and noise are unknown here. Electricity uses derived operating watts × 8 h/day × 365 at $0.16/kWh; filters and purchase price are excluded.

Rainbow Brisk Box Ultra

Brisk Box Ultra · Certification ID 4518178

Certified smoke CADR: 370 cfm
Certified efficiency: 23.27 cfm/W
Derived operating watts: 15.9 W
8 h/day electricity scenario: $7.43/yr

Why it matches: its 370 cfm delivers approximately 18.50 eACH in your 150 ft² × 8 ft room, meeting your 4.8 target at the listed output. Its certified efficiency places it among the first four eligible matches under our efficiency sort.

Quieter-speed performance and noise are unknown here. Electricity uses derived operating watts × 8 h/day × 365 at $0.16/kWh; filters and purchase price are excluded.

Rainbow Luggable Ultra

Luggable Ultra · Certification ID 4518200

Certified smoke CADR: 231 cfm
Certified efficiency: 21.59 cfm/W
Derived operating watts: 10.7 W
8 h/day electricity scenario: $5.00/yr

Why it matches: its 231 cfm delivers approximately 11.55 eACH in your 150 ft² × 8 ft room, meeting your 4.8 target at the listed output. Its certified efficiency places it among the first four eligible matches under our efficiency sort.

Quieter-speed performance and noise are unknown here. Electricity uses derived operating watts × 8 h/day × 365 at $0.16/kWh; filters and purchase price are excluded.

Explore all room-sizing matches

Bedroom area and ceiling-height reference

Illustrative room areas, not estimates of typical bedroom sizes. All values below use 4.8 eACH. Raising a ceiling from 8 to 9 ft adds 12.5% to the required CADR for the same floor area.

Smoke CADR requirements at 4.8 eACH for two ceiling heights
Floor area	8-ft ceiling	9-ft ceiling
100 ft²	64 cfm	72 cfm
150 ft²	96 cfm	108 cfm
200 ft²	128 cfm	144 cfm
250 ft²	160 cfm	180 cfm
300 ft²	192 cfm	216 cfm

What the certification snapshot adds

These counts show how the available certified-output pool changes with bedroom size and ceiling height. Median efficiency and electricity summarize all energy-eligible matches, not just the shortlist. Higher-output units remain in the pool; this is not an equal-CADR cost comparison.

Matching certification records and energy summaries for bedroom scenarios
Scenario	Required CADR	Matches / 247	Energy-eligible n	Median cfm/W	Median electricity / yr
100 ft² × 8 ft	64 cfm	221	221	6.33	$14.20
100 ft² × 9 ft	72 cfm	213	213	6.34	$14.62
150 ft² × 8 ft	96 cfm	200	200	6.34	$15.84
150 ft² × 9 ft	108 cfm	191	191	6.34	$15.93
200 ft² × 8 ft	128 cfm	173	173	6.34	$17.24
200 ft² × 9 ft	144 cfm	154	154	6.44	$18.50
250 ft² × 8 ft	160 cfm	125	125	6.34	$20.70
250 ft² × 9 ft	180 cfm	120	120	6.33	$22.19
300 ft² × 8 ft	192 cfm	117	117	6.34	$22.19
300 ft² × 9 ft	216 cfm	105	105	6.36	$23.13

Electricity scenario: derived operating watts × 8 hours/day × 365 days × $0.16/kWh. This is not ENERGY STAR’s reported annual energy or measured overnight usage. Energy summaries require finite positive derived watts and certified efficiency; missing values are excluded, not treated as zero.

Before choosing a purifier for sleep

Ask for CADR at the fan setting you intend to use, noise measurements at that same setting, and whether lights can be switched off. A larger maximum CADR alone cannot establish adequate clean-air delivery at low speed.

Our source reports certification performance. Room coverage, eACH and electricity scenarios are our separate calculations. Noise, lower-speed CADR, retail prices, filter costs, lifespan and hands-on performance are not verified in this snapshot. Placement, mixing, doors and ongoing particle sources can affect real-room results; gas, odor removal and medical outcomes cannot be inferred from smoke CADR.

Review our methodology and downloadable source data, room-coverage study, and CADR guide. Original source: ENERGY STAR Certified Room Air Cleaners V3.0.