what filter fits perfect in the 4" filter box?

the 4" and 6" filters take 12x20x1" filters; the 8 and 10" box's take 14x20x1" filters

What filter replacement is suggested for the 6" filter box? standard 20x12x1 does not fit.

Different brands of filters have different "actual" sizes. Look up the true size of the filter you are using, then check actual filter sizes for different brands that are smaller.

Do the filters trap smoke from pipes or pollen and mildew?

No, you need a carbon filter for smoke

Can I use a MERV 17 or HEPA filter instead of a MEV13 filter for additional filtration if they will even fit?

I use the HDX FPR 12 Ultimate Allergen with odor reduction. This filter is a higher end filter.

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🌿 Elevate your air game—because your home deserves the freshest vibe.

COMPACT POWERHOUSE - Sleek 23.46 x 8.42 x 11.73” footprint fits discreetly while delivering maximum fresh air intake.
EFFORTLESS MAINTENANCE - Slide lock door with neoprene seal offers quick, dust-free filter changes without hassle.
SEAMLESS COMPATIBILITY - Designed to fit 100mm (4-inch) inline duct fans, supporting up to 400 CFM airflow for whole-house ventilation.
BUILT TO BRAVE THE ELEMENTS - Rugged 1mm cold-rolled steel and aluminum flanges ensure weatherproof, long-lasting performance.
BREATHE CLEANER LIVE BETTER - MERV 13 filter traps viruses, dust, pollen, and mold spores for healthier indoor air quality.

The AC Infinity Inline Filter Box 100mm is a robust HVAC filtration solution featuring a durable 1mm cold-rolled steel and aluminum build, a high-efficiency MERV 13 filter that captures harmful particles, and compatibility with 4-inch inline duct fans supporting up to 400 CFM airflow. Its slide lock door and neoprene seal enable easy, dust-free maintenance, making it ideal for whole-house fresh air intake and ventilation.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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¥52705

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TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

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Brand	AC Infinity
Model	AC-AFB4
Product Dimensions	2.35 x 1.17 x 0.84 cm; 6.42 kg
Part Number	AC-AFB
Colour	Black
Compatible Devices	Air Conditioner
Material Type	Alloy Steel, Aluminium
Batteries included?	No
Batteries Required?	No
Item Weight	6.42 kg

AC Infinity Inline Filter Box 100mm with High Efficacy Filter, Whole House HVAC Filtration Kit, Fits 100mm Inline Duct Fans for Fresh Air Intake and Ventilation, 4-Inch

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