# FX HelixDepth (FX-HDG)

> Fil-Trek Gas Filters. Canonical page: https://www.fil-trek.com/products/gas-filters/fx-hdg

Category: Gas Filters
Series: FX-HDG
Model format: `FX-HDG-[SIZE CODE]-[MEDIA]-[MICRON]-[SEAL]`
Example: `FX-HDG-328-PE-0.3-V`

## Overview
HelixDepth FX-HDG elements are depth-style cartridges designed for particulate removal in gas streams with industry compatible quick change out form factor. Featuring gradient-density matrix that captures more particulates, delivers higher dirt-holding capacity, extends service life, and provides the lowest cost of ownership in the industry.

## How It Works
Gas flows outside‑to‑inside through a multi‑layer depth matrix. Larger particles are captured on outer layers while fine solids are retained deeper in the structure, maintaining low pressure drop and high solids holding capacity. FX version features a keyed interface between the housing riser and inner cartridge top cap to keep the element concentric, prevent sag under liquid load, and maintain a tight gasket-to-cup seal to eliminate bypass.

## Applications
- Dry gas transmission, processing and storage
- Compressor suction/discharge
- Gas gathering
- Metering / custody transfer
- Glycol and amine contactor protection
- Fuel gas
- Utility & instrument air
- Removal of fine, deformable, and shear‑sensitive solids such as sand, iron sulfide, iron oxide, pipe scale, dust, salts, asphaltenes, coal fines, paraffins

## Physical Specifications
- **flow direction:** Outside-to-inside
- **outside diameter options:** 4.5"
- **inner diameter options:** 3.0"
- **nominal length options:** 28", 43", 79"
- **end cap options:** FX bottom cap
- **top cap options:** FX top cap
- **inner core materials:** Stainless Core
- **outer core materials:** None
- **outer wrap materials:** None
- **size options:** 328, 343, 379
- **gasket material options:** Buna-N, EPDM, Viton
- **special notes:** 5.5" OD requires metal core

## Media Specifications
- **media primary options:** Polyester, Polypropylene
- **micron ratings:** 0.1, 0.3, 0.5, 1, 5, 10
- **efficiency percent:** 99.98
- **media rating:** Absolute
- **beta ratio:** 5000
- **changeout dp:** 15 PSID
- **burst pressure:** 50 PSID
- **max temperature:** 180°F (Polypropylene), 240°F (Polyester)
- **approvals certifications:** None

## Housing Compatibility
- Fil-Trek FX70 Series
- Parker Series 70 TITAN PuraSep
- Parker Series 75 TITAN PuraSep

## Competitor Cross-Reference
- Parker Peco EZ-PCHG DYNASEP
- Jonell Depth-LOK Quick-Change (JQC)

## Ordering
- Model format: `FX-HDG-[SIZE CODE]-[MEDIA]-[MICRON]-[SEAL]`
- Example: `FX-HDG-328-PE-0.3-V`

### Media codes
- **PE:** Polyester
- **PO:** Polypropylene

### Seal codes
- **B:** Buna-N
- **E:** EPDM
- **V:** Viton

### Size codes
- **328:** OD 4.5", ID 3", length 28"
- **343:** OD 4.5", ID 3", length 43"
- **379:** OD 4.5", ID 3", length 79"

### Micron ratings
- 0.1, 0.3, 0.5, 1, 5, 10

## Contact
- **sales@fil-trek.com** — all filtration product inquiries, projects, filter housings, and filtration systems
- **filters@fil-trek.com** — replacement filter media, filter elements, filter bags, hardware, and spare parts

## Links
- HTML: https://www.fil-trek.com/products/gas-filters/fx-hdg
- Markdown: https://www.fil-trek.com/products/gas-filters/fx-hdg.md