---
product_id: 26945025
title: "Napa 6637 Gold Air Filter"
brand: "napa"
price: "HK$1094"
currency: HKD
in_stock: true
url: https://www.desertcart.hk/products/26945025-napa-6637-gold-air-filter
store_origin: HK
region: Hong Kong
---

# Precise 12.38x4.5x12.38 in fit Premium NAPA Gold quality OEM-grade reliability Napa 6637 Gold Air Filter

**Brand:** napa
**Price:** HK$1094
**Availability:** ✅ In Stock

## Summary

> 🟡 Elevate your equipment’s breathability with NAPA Gold – because your gear deserves the best!

## Quick Answers

- **What is this?** Napa 6637 Gold Air Filter by napa
- **How much does it cost?** HK$1094 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/26945025-napa-6637-gold-air-filter)

## Best For

- napa enthusiasts

## Why This Product

- Trusted napa brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable Cellulose Media:** High-quality cellulose filter media ensures superior contaminant capture and airflow
- • **Trusted NAPA Gold Standard:** Backed by NAPA’s premium sub-brand for unmatched reliability and longevity
- • **Universal Fit, Zero Hassle:** Designed to fit a wide range of equipment with a perfect 12.38 x 4.5 x 12.38 inch dimension
- • **Engineered for OEM Excellence:** Meets exact OEM air filter change intervals for peak equipment performance
- • **Non-Washable, Maintenance-Free:** Optimized for single-use replacement, eliminating guesswork and downtime

## Overview

The Napa 6637 Gold Air Filter is a premium, OEM-recommended rectangular air filter featuring durable cellulose media and precise 12.38 x 4.5 x 12.38 inch dimensions. Designed for universal fit across various equipment, it guarantees superior filtration performance and reliability under the trusted NAPA Gold sub-brand. This non-washable filter ensures hassle-free maintenance and optimal airflow, making it the go-to choice for professionals who demand excellence.

## Description

Napa 6637 Gold Air Filter

## Features

- NAPA Gold Filters Are Recommended For OEM Air Filter Change Intervals
- Air Filter Assembly for Various Equipment
- Donaldson ECB Series - Air Filter Assembly for Various Equipment

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | NAPA |
| Product Dimensions | 12.38"L x 4.5"W x 12.38"H |
| OEM Part Number | 145898 |
| Shape | Round |
| Manufacturer | NAPA |
| Automotive Fit Type | Universal Fit |
| UPC | 765809166073 |
| Item Weight | 3.6 pounds |
| Item model number | 6637 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 46637 |
| Special Features | Bottom I.D. (Inches): 4 in. Bottom I.D. (mm): 102 mm Bottom Inside Diameter: 4 in Bottom O.D. (Inches): 8.5 in. Bottom O.D. (mm): 216 mm Bottom Outside Diameter: 8.5 in Filter Type: Round Height: 12.38 in Height (Inches): 12.38 in. Height (mm): 314 mm Media Material: Cellulose Style: Air Filter Top I.D. (Inches): Closed Top I.D. (mm): Closed Top O.D. (Inches): 8.5 in. Top O.D. (mm): 216 mm Top Outside Diameter: 8.5 in UNSPSC: 40161505 |

## Product Details

- **Brand:** NAPA
- **Product Dimensions:** 12.38"L x 4.5"W x 12.38"H
- **OEM Part Number:** 145898
- **Shape:** Round
- **Manufacturer:** NAPA

## Images

![Napa 6637 Gold Air Filter - Image 1](https://m.media-amazon.com/images/I/31jLJsTsmBL.jpg)

## Questions & Answers

**Q: Is this carb compliant for smog in california?**
A: Good Morning,
Thank you for contacting us, we cannot guarantee such compliance. and we just don't have that filter in stock, we have now the Fleetguard AH1141 we leave the information according to its attributes so they can compare:
Overall Height: 314.45 mm (12.38 in)
End Connection Height: 35.052 mm (1.38 in)
Largest housing OD: 215.9 mm (8.5 in)
End Connection ID: 101.6 mm (4 in)
Primary Applications
CUMMINS: 3912020
DONALDSON: B085011
Thank you, we hope the information has been helpful. Any questions or additional information you need, we are at your service.

**Q: Is this the same filter as a Donaldson 6637 filter?**
A: The Donaldson equivalent to a Napa 6637 is Donaldson B085011

**Q: What do I need to bolt in a 1997 f250 7.3?**
A: all you need is a 4"to 4" exhaust adaptor from your local Napa,fleet farm whatever. remove stock air box, zip tie senser, use stock clamp from stock rubber tube and find a 4.5 inch clamp for the filter or do what I did on the last 4- 7.3s I've done and use elec. tape to seal filter to pipe. take yer time make it look good and its good to go

**Q: What do I need to bolt in a 1997 f250 7.3?**
A: You need a 45° PVC elbow, 4" diameter, and 2 big hose clamps.
And remove your old air box, all of it.

## Frequently Bought Together

- Napa 6637 Gold Air Filter
- Air Pre-Filter Preclean Sleeve for Napa 6637 Donaldson B085011 Baldwin PA2818 Fleetguard AH1141 Fram CA6818 Wix 46637 Filter, White
- Spectre Performance 9709 4" Straight Aluminum Intake Tube,Silver

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**Shop now:** [https://www.desertcart.hk/products/26945025-napa-6637-gold-air-filter](https://www.desertcart.hk/products/26945025-napa-6637-gold-air-filter)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-08*