Airaid Red Dry Universal Oval Air Filter – 4.5 in Flange

Airaid Red Dry Universal Oval Air Filter – 4.5 in Flange

Airaid 721-128 is a washable, oil-free synthetic clamp-on air filter selected by connection size and physical clearance. The red filter has a 4.5 in (114 mm) flange and 7.375 in (187 mm) height. Compare the complete shape before replacing an existing filter.

Key Features

• Dry synthetic media; no re-oiling
• Washable construction
• Mounting flange: 4.5 in (114 mm)
• Filter height: 7.375 in (187 mm)

Fitment

Specifications

Whats Included

• One replacement air filter

About Airaid

Airaid develops intake systems, reusable air filters, PowerAid throttle-body spacers and U-Build-It fabrication components. Filter media, connections, kit contents and vehicle compatibility vary by part number.

Related Parts

• 790-553 Airaid Air Filter Cleaner
• Browse the Airaid collection brand browsing only, not a vehicle compatibility claim

FAQ

What is the 721-128?

It is an Airaid reusable dry synthetic air filter for a dimension-matched clamp-on intake.

How is fitment determined?

This is selected by flange size, overall dimensions and intake layout, not simply by vehicle year or brand. The flange is 4.5 in (114 mm) and the filter height is 7.375 in (187 mm).

Is the filter washable?

Yes. Clean it with the Airaid procedure and service product intended for this media, then allow it to dry fully.

Does the media require oil?

No. This dry synthetic version should not receive filter oil.

Is a complete intake included?

No. The listing supplies one replacement filter, not a tube, heat shield or complete vehicle intake system.

Can another filter with the same flange be substituted?

Not automatically. Also compare height, taper or oval shape, flange offset and available clearance.

How often should it be serviced?

Inspect according to operating conditions. Heavy dust, off-road use and contamination can require more frequent cleaning than normal road use.

Is a horsepower increase guaranteed?

No fixed gain is promised for a replacement filter. Results depend on the complete engine and intake configuration.

Installation Instructions

1. Measure the existing mounting connection and compare every filter dimension before removing the old filter.
2. Clean the mounting flange and prevent debris from entering the intake.
3. Seat the replacement fully, secure it using the intake manufacturers clamp procedure, and check surrounding clearance.
4. Inspect the seal and confirm the filter cannot contact hot, moving or sharp components.

Review the manufacturer product and service information.

Prop 65 Warning

WARNING: Cancer and Reproductive Harm. For more information, visit www.P65Warnings.ca.gov.