Which Model is Best for You

Choose BioGS Air Purifiers for:
  • General air quality issues such as dust and allergen removal
  • General household odors and chemicals
  • Seasonal allergens
Choose MinusA2 Air Purifiers for:
  • Musty odors from cigarettes, mildew, mold etc. (Choose Odor Remover customized filter)
  • Bacteria, virus and mold removal. Perfect for people such as babies, kids, elderly people, and those weakened by illness. (Choose Germ Defense customized filter)
  • VOCs and chemical fumes (Choose Toxin Absorber customized filter)
  • Heavy pet dander (Choose Pet Allergy customized filter)
  • High level of allergens


All Models MinusA2 SPA-780A
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MinusA2 SPA-700A
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BioGS SPA-625A BioGS SPA-550A
Room Coverage (based on 2 air changes per hour) up to 815 sq. ft. up to 700 sq. ft. up to 625 sq. ft. up to 550 sq. ft.
Dimension (inches) 20H x 21.4W x 7D 20H x 21.4W x 7D 22.2H x 16.6W x 9.8D 22.2H x 16.6W x 9.8D
Warranty 5 Years 5 Years 5 Years 5 Years
Price $549.95 $459.95 $399.95 $369.95
True HEPA Filtration Yes Yes Yes Yes
Air Purification Stages 1 - Pre-Filter
2 - Medium Filter
3 - HEPA Filter
4 - Customized Filter
5 - Charcoal Filter
6 - Negative Ions
1 - Pre-Filter
2 - Medium Filter
3 - HEPA Filter
4 - Customized Filter
5 - Charcoal Filter
6 - Negative Ions
1 - Pre-Filter
2 - Charcoal Filter
3 - HEPA Filter
4 - Negative Ions
1 - Pre-Filter
2 - Charcoal Filter
3 - HEPA Filter
4 - Negative Ions
Ozone Emissions Zero* Zero* Negligible** Negligible**
CADR 208 Pollen
200 Dust
193 Smoke
201 Pollen
200 Dust
193 Smoke
189 Pollen
165 Dust
152 Smoke
162 Pollen
149 Dust
135 Smoke
Air Flow (Cubic Feet per minute) Speed 1 - 58 CFM
Speed 2 - 80 CFM
Speed 3 - 112 CFM
Speed 4 - 159 CFM
Speed 5 - 218 CFM
1 - 47 CFM
2 - 64 CFM
3 - 97 CFM
4 - 140 CFM
5 - 187 CFM
1 - 42 CFM
2 - 66 CFM
3 - 95 CFM
4 - 137 CFM
5 - 167 CFM
1 - 42 CFM
2 - 66 CFM
3 - 78 CFM
4 - 117 CFM
5 - 147 CFM
Noise Level (Decibels) Speed 1 - 25.6 dBA
Speed 2 - 31.1 dBA
Speed 3 - 37.4 dBA
Speed 4 - 44.5 dBA
Speed 5 - 51.3 dBA
1 - 20.8 dBA
2 - 24.6 dBA
3 - 31.3 dBA
4 - 39.2 dBA
5 - 45.6 dBA
1 - 22.8 dBA
2 - 28.6 dBA
3 - 37.2 dBA
4 - 46.7 dBA
5 - 50.4 dBA
1 - 22.8 dBA
2 - 28.6 dBA
3 - 33.5 dBA
4 - 44.3 dBA
5 - 48.6 dBA
Filter Life Span 1 - 2 years 1 - 2 years 1.5 - 3 years 1.5 - 3 years
Annual Filter Replacement Cost
(based on 24/7 continuous operation)
$85 $85 $53.30 $53.30
Power Consumption 7 to 61 watts
(Energy Star)
7 to 47 watts
(Energy Star)
5 to 39 watts
(Energy Star)
5 to 29 watts
(Energy Star)
Colors Available White
Black
White White White
Stand Alone /
Wall Mountable
Stand Alone /
Wall Mountable
Stand Alone /
Wall Mountable
Stand Alone Stand Alone
Ultra Quiet Yes Yes Yes Yes
Particle Sensor Yes Yes Yes Yes
Odor Sensor Yes Yes Yes Yes
Light Sensor Yes Yes No No
Remote Control Yes Yes Yes Yes
Deodorization Yes Yes Yes Yes
Weight 19.4 lbs. 19.4 lbs. 16.8 lbs. 16.8 lbs.

*Zero ozone emission with negative ion generator turns off. An amount of 0.002 ppm (parts-per-million) was recorded at low fan speed with negative ionizer turned on. That is 25 times less than the 0.05 ppm maximum ozone concentration safety standard set forth by the California Air Resource Board.

**An amount of 0.001 ppm (parts-per-million) was recorded with negative ionizer turned on. That is 50 times less than the 0.05 ppm maximum ozone concentration safety standard set forth by the California Air Resource Board.