Xiaomi Smart Air Purifier 4 Compact

Xiaomi Smart Air Purifier 4 Compact

Xiaomi Smart Air Purifier 4 Compact is a small, affordable, and effective air purifier designed for bedrooms, home offices, or small spaces. It’s the smallest in Xiaomi’s Series 4 lineup, emphasizing quiet operation, smart features, and strong particle filtration in a compact cylindrical form.

Key Specifications

• Dimensions: ≈ 8.6″ diameter (220 mm) × 14″ height (355 mm) — very portable at about 4.8–4.85 lbs (2.2 kg).

• CADR (Clean Air Delivery Rate): 230 m³/h (≈135 CFM) for particles. Suitable for rooms up to 48 m² (≈516 ft²) at 2 ACH or more realistically 158–206 ft² (15–19 m²) for higher air changes per hour.
• Filtration: 3-in-1 cylindrical filter (pre-filter + high-efficiency HEPA-like media + activated carbon). Claims 99.97% removal of particles down to 0.3 microns (up to 99.99% at 0.1 microns), including dust, PM2.5, pollen, pet dander, smoke, and some odors. TÜV Rheinland Allergy Care certified.
• Noise: As low as 20 dB (sleep mode) — very quiet. Tests show ~33–35 dB in low/sleep modes and up to ~53–60 dB at max. Excellent for bedrooms.
• Power: Max 27W (very efficient; low running costs).
• Sensors & Modes: PM2.5/particulate sensor, auto mode, sleep mode, air quality indicator (color-coded). Multiple fan speeds.
• Connectivity: Mi Home app support (smart control, monitoring), voice control compatibility. Some regional models vary slightly in Wi-Fi features.
• Filter Life: Typically 6–12 months (replace indicator in app). Filters are affordable (~$30–50).

Performance

Independent tests praise its particle removal:

• Rapidly reduces PM2.5/PM10 to near-zero in small rooms (e.g., excellent results in ~37–60 minutes at max or moderate speeds).
• Strong for allergens and fine dust; weaker on strong VOCs/odors due to the modest carbon layer.
• Good value in the sub-$100 category, with low ongoing costs.

Pros:

• Compact and lightweight — fits on desks, shelves, or floors (dual-use design).

Xiaomi Smart Air Purifier 4 Compact – Xiaomi United States

• Quiet and energy-efficient.
• Strong real-world particle performance and smart features.
• Affordable purchase and maintenance.

Cons:

• Best for small rooms only (not whole-house).
• Limited odor/VOC handling.
• Basic display; app could show more data in some reviews.