FS-Curtis RNB400 Non-Cycling Refrigerated Dryer 400 SCFM #FRNBX00400-4XA5XX

FS-Curtis RNB400 — 400 SCFM Refrigerated Air Dryer

A plant running a large rotary screw compressor around the 75-100 HP range needs matched drying capacity, not a smaller unit working past its limit — the RNB400 is sized specifically for that output range.

That's what the FS-Curtis RNB400 solves — a 400 SCFM non-cycling refrigerated dryer, built for shops that want dependable dew point control without paying for features this air volume doesn't call for. It's also available with a factory-matched Filter Package (prefilter CF7-40-16-DG + afterfilter CF5-40-16-DG) as an add-on option, which means the dryer and its filtration ship as one order, one delivery, and one part number to track instead of three.

Who the RNB400 Is Built For

• ✅ An industrial facility or large commercial shop running a high-output rotary screw compressor that needs matched, continuous-duty drying capacity
• ✅ An operation with a centralized compressed air system feeding multiple work areas, production lines, or bays from one header
• ✅ A facility that needs dependable, round-the-clock dew point control at high SCFM without the pressure drop that undersized filtration or dryers introduce
• ✅ A plant manager replacing an aging industrial dryer who needs the new unit to match or exceed the old one's throughput without a costly re-pipe of existing 2-inch/3-inch/4-inch flanged connections
• ✅ An operation where compressed air system downtime for dryer service is expensive, making reliability and manufacturer-backed 2-year coverage a real purchasing factor, not an afterthought

What the RNB400 Is NOT Built For

• ❌ Small or mid-size shops — this tier is sized for industrial-volume air systems and is oversized, and overpriced, for a single-bay or light commercial operation
• ❌ Facilities without existing 3-phase power infrastructure or the floor space and flanged/NPT piping this unit's footprint and connections require

What Makes the RNB400 Different

Heat Exchanger

The RNB400 uses a stainless steel brazed plate heat exchanger, engineered for reliable, consistent dew point control at 400 SCFM without fouling or excess pressure drop.

Condensate Drain

Timed electric drain removes collected moisture automatically — moisture gets cleared out on a fixed schedule, with zero day-to-day attention from your crew.

Refrigerant & Air Quality

Uses R513A refrigerant, a low global-warming-potential option, and delivers ISO 8573-1:2010 Class 4–5 pressure dew point — dry, reliable air for general shop and industrial use.

Optional Filter Package

Choose the “Includes Filter Package” option to add a factory-matched prefilter (CF7-40-16-DG) and afterfilter (CF5-40-16-DG), sized to this dryer's flow rate and ready to plumb — one less step for your install crew.

Full Specifications — RNB400

FS-Curtis Warranty — RNB400

FS-Curtis backs the RNB400 with a 2-year parts & labor warranty.

Warranty service is through Alamo Equipment & Service — call (844) 480-6059 instead of waiting on a manufacturer hotline. Coverage is subject to FS-Curtis warranty terms, conditions, and requirements.