Collection: 4 Inch Inline Fans and Filters

Spider Farmer 4" Inline Duct Fan with Temperature and Humidity Controller

5.0 / 5.0

(2) 2 total reviews

Spider Farmer 4" Inline Duct Fan with Speed Controller

5.0 / 5.0

(1) 1 total reviews

AC Infinity CLOUDLINE S4, Quiet Inline Duct Fan System with Speed Controller, 4-Inch

4.9 / 5.0

(117) 117 total reviews

Active Air 4" Inline Duct Fan, 165 CFM

Active Air Pre-Filter for ACCF144, 4" x 14"

Active Air Carbon Filter, 4" x 14", 215 CFM

F5 Fans 4" Turbo EC Inline Duct Fan

Mars Hydro iFresh 4" Smart Inline Duct Fan

5.0 / 5.0

(2) 2 total reviews

Spider Farmer 4" Incline Air Carbon Filter

Air Box 1 Stealth Edition 4" Carbon Filter

AC Infinity Automatic Booster Duct Fan, Inline Fan with Pressure Switch, 4-Inch

AC Infinity Refillable Carbon Filter Kit, with Charcoal Refill, 4-Inch

5.0 / 5.0

(1) 1 total reviews

Charco Filters Plus 4" X 8" Activated Carbon Air Filter

Charco Filters Plus 4" X 10" Activated Carbon Air Filter

Mars Hydro 4" Inline Air Carbon Filter

Mars Hydro 4" Inline Duct Fan with Speed Controller

5.0 / 5.0

(3) 3 total reviews

Mars Hydro 4" Inline Duct Fan with Temperature and Humidity Controller

5.0 / 5.0

(4) 4 total reviews

AC Infinity RAXIAL S4, Inline Booster Duct Fan with Speed Controller, 4-Inch

4.6 / 5.0

(20) 20 total reviews

AC Infinity Air Filter Box with High Efficacy Filter, 4-Inch

5.0 / 5.0

(2) 2 total reviews

AC Infinity Duct Carbon Filter XL, Australian Charcoal, Extra Large, 4-Inch

AC Infinity CLOUDLINE T4, Quiet Inline Duct Fan System with Temperature and Humidity Controller, 4-Inch

4.8 / 5.0

(121) 121 total reviews

AC Infinity CLOUDLINE LITE A4, Quiet Inline Fan with Speed Controller, 4-Inch

5.0 / 5.0

(8) 8 total reviews

AC Infinity Pre-Filter Cloth for Inline Carbon Filter, 4-Inch, 2-Pack

AC Infinity Inline Duct Fan Silencer, 4-Inch

4.55 / 5.0

(22) 22 total reviews