Castair C-FS34 — 3/4" Particulate Filter, 250 PSI, 160 CFM, 5-Micron
The C-FS34 is a 3/4-inch NPT standard-size particulate air filter from Castair — filtration only, sized for mid-range shop air systems running 3/4-inch main lines. It handles 160 CFM at up to 250 PSI maximum inlet pressure, covering most mid-size commercial compressors and multi-station installations where the main distribution line is 3/4-inch pipe.
Use the C-FS34 when you need solid particulate removal at a 3/4-inch line and pressure regulation is handled elsewhere in the system. If you need both filtration and regulation at this location, use the C-FRS34 combo unit instead — same port size and flow, with a built-in regulator and gauge.
What This Unit Does
- 5-Micron Particulate Filtration: Removes pipe scale, rust, and solid airborne debris from the compressed air stream, protecting tools and downstream equipment from abrasive contamination.
- 8.5 oz Bowl: Catches liquid water and condensed oil carryover. Manual drain standard; automatic float drain available as an add-on.
- Filter Only: No regulator or gauge. If you need pressure control at this point, use the C-FRS34.
- 3/4" NPT Female Connections: Standard threading — no adapters needed for 3/4-inch pipe or fittings.
Castair Particulate Filter Lineup
- C-FM14 (1/4" Mini): 150 PSI max, 38 CFM, 1.5 oz bowl
- C-FS12 (1/2" Std.): 250 PSI max, 140 CFM, 8.5 oz bowl
- C-FS34 (3/4" Std.): 250 PSI max, 160 CFM, 8.5 oz bowl
- C-FS10 (1" Std.): 250 PSI max, 180 CFM, 11 oz bowl
- FS114 (1 1/4"): 250 PSI max, 390 CFM, 16 oz bowl
- FS112 (1 1/2"): 250 PSI max, 390 CFM, 16 oz bowl
Technical Specifications
- Part Number: C-FS34
- Port Size: 3/4" NPT Standard
- Connection Type: NPT Female Inlet and Outlet
- Maximum Inlet Pressure: 250 PSI
- Flow Rating: 160 CFM
- Filtration Grade: 5-Micron Particulate
- Bowl Capacity: 8.5 oz
- Regulator: Not included
- Manufacturer: Castair, Spicer, Minnesota
Why Buy From Air Compressor Factory Direct?
We have sold and supported Castair air system components since 2016. Call 866-217-0063 to confirm the right filter for your line size and system configuration. Free shipping on qualifying orders, full manufacturer warranty, free tech support on every order.
Call 866-217-0063 for quick answers and help!
