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For serious air quality concerns (pollution, allergies), True HEPA (99.97% efficiency) is essential. HEPA-type (85-95%) may be adequate for light dust control but will not handle PM2.5 or allergens effectively.

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Focus on smoke CADR for PM2.5 and general air quality. Pollen CADR for allergies. Smoke particles are the hardest to filter, so if smoke CADR is adequate, the purifier will handle larger particles well.

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Typically 6-12 months depending on air quality and usage. In high-pollution areas like Delhi, expect 6-8 months. Clean pre-filters monthly to extend HEPA life. Follow manufacturer guidelines and filter indicators.

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No. True HEPA filters cannot be washed - it destroys the fiber structure and eliminates filtration effectiveness. Only pre-filters are typically washable. Replace HEPA filters as recommended for continued protection.

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Not necessarily. Look for multiple fan speeds - higher CADR models often have better motors and fan design. Check noise levels at different speeds. Many high-CADR purifiers are quiet on low settings for nighttime use.

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Not always. Focus on certification (H13/H14), appropriate CADR for your room, and total cost of ownership including filter replacements. Some budget models with genuine HEPA can outperform expensive models with marketing fluff.

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Delhi/NCR requires 2× room size CADR for 4 air changes/hour during pollution season (Oct-Jan, AQI 300-500). Examples: 150 sq ft bedroom needs 300+ CADR. 300 sq ft master bedroom needs 600+ CADR. 450 sq ft living room needs 900+ CADR (or use 2 purifiers with 450 CADR each). Why: High outdoor PM2.5 means constant infiltration through windows/doors. More air changes = faster pollutant removal. Budget for higher CADR than spec sheets suggest for Delhi winters.

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Filtration efficiency at 0.3 micron: H11 = 95% efficiency (NOT True HEPA). H13 = 99.97% efficiency (True HEPA standard). H14 = 99.995% efficiency (Medical/Hospital grade). Real-world impact: H13 removes 9,997 out of 10,000 particles. H14 removes 9,999.5 out of 10,000 particles. When H14 matters: Severe allergies, asthma, immune-compromised individuals, homes with newborns. H13 sufficient for: General pollution, dust, pollen, PM2.5 removal. Save ₹2,000-3,000 unless medical necessity.

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Step 1: Calculate room volume = Length × Width × Height (in feet). Example: 12ft × 15ft × 9ft = 1,620 cubic feet. Step 2: Determine desired air changes per hour (ACH). Standard = 2 ACH. High pollution = 4 ACH. Medical/allergies = 5 ACH. Step 3: Required CADR = (Room Volume × ACH) ÷ 60 minutes. Example: (1,620 × 4) ÷ 60 = 108 CADR minimum. Practical tip: Simpler rule: CADR = Room area (sq ft) for 2 ACH. Double it for Delhi/NCR or allergy sufferers.

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Run 24/7 on auto mode for best results. Indoor pollutants accumulate constantly: cooking fumes, dust from walking, skin cells, VOCs from furniture, outdoor pollution infiltration. Smart approach: Use auto/sensor mode - purifier adjusts speed based on real-time AQI. Sleep mode at night (low fan, <25 dB). Turbo during cooking or when AQI spikes. Cost: 24/7 operation costs ₹150-300/month electricity (40-60W average) + ₹500/month filter depreciation. Health benefit: Consistent clean air prevents allergy triggers, better sleep, reduced respiratory issues.

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No, single purifier cannot effectively clean multiple closed rooms. Air purifiers clean only the room they're in. Closed doors/walls block airflow. Open floor plan exception: Single 800-1000 CADR purifier can handle open-concept living/dining/kitchen (600-800 sq ft total) IF no walls separating. Whole-house solution: Individual purifier per bedroom + one for living area (3BHK needs 4 purifiers typically). OR centralized HVAC air purification system with duct distribution (₹50,000+ installation). Budget approach: Portable purifier - move to bedroom at night, living room during day. Prioritize rooms where you spend most time.