Description

The EMAX Silent Air Industrial Plus pairs a 7.5 HP two-stage stationary air compressor with a matched 30 CFM refrigerated air dryer, delivered as one complete shop air system. The compressor runs on 460V three-phase power, builds to 175 PSI, and delivers 31 CFM — enough headroom to keep impact tools, sanders, and several air drops working at once.

The headline is the patented Silent Air intake silencer, which targets intake noise — the loudest source of compressor sound — for operation up to 50% quieter than a comparable open-intake compressor, without the cost or restricted service access of a full enclosure cabinet. The 80-gallon vertical tank keeps the footprint tight, and the pressure-lubricated, 100% cast-iron pump is built for continuous-run, high-duty-cycle work with an estimated 70,000-hour pump life.

Features

Silent Air intake silencer

The patented Silent Air system reduces intake noise with noise-reducing baffle plates and high-capacity filter media, bringing sound down toward conversational levels. Because the silencer is serviceable rather than a sealed cabinet, routine maintenance and component access stay simple.

Pressure-lubricated pump

A gear-driven oil pump mounted to the rear of the crankshaft delivers continuous, pressurized oil to every bearing point, keeping bearings cool and extending pump life. The crankshaft and connecting rods are rifle-drilled for direct oil flow to high-friction wear points, a spin-on automotive-style oil filter keeps the oil clean, and a liquid-filled analog gauge lets you monitor oil pressure at a glance. An adjustable regulator tunes oil pressure across the RPM range, and a bleeder valve makes priming quick. Unlike splash-lubricated pumps, pressure lubrication places oil precisely where it is needed under continuous load.

100% cast-iron construction

The crankcase, cylinders, and cylinder heads are all cast iron — no aluminum sleeves beneath the paint. Cylinders are CNC-machined and precision-honed for concentric bores that reduce oil carryover and support long ring life, and deep cooling fins maximize surface area for high-duty-cycle cooling. Deep-bored, threaded head holes hold proper torque for long-term head-gasket durability.

Cast-iron cylinder heads with disc valves

Solid cast-iron heads use CNC-machined concentric-ring (disc) valves, surface-ground for sealing and long service life. Disc valves are serviceable in minutes — remove the retainer, lift the valve for inspection, and reinstall — and the disc-valve seal holds head-gasket torque without retorquing.

Four-ring pistons and rebuildable connecting rods

The cast-iron high-pressure pistons run a four-ring design — two oil-control rings to clear excess oil on the downstroke and two compression rings to seal against blow-by — which minimizes oil carryover and extends ring life. CNC-machined solid cast-iron connecting rods use replaceable bearing inserts and wrist pins, so the rod assembly is fully rebuildable rather than throwaway. On the two-stage pump, the low-pressure pistons are aluminum, where loads are light (around 45 PSI).

Cast-iron flywheel

The 7.5 HP pump uses a 20-inch cast-iron flywheel with two B-style groove belts and nine large cooling fins. The added rotating mass lowers amp draw and energy use, while the wide belt contact surface extends belt life and the cooling fins pull more air across the pump.

Continuous-run head unloaders

On this fully packaged electric unit, head unloaders relieve the intake valve at preset pressure so the motor keeps running instead of repeatedly restarting under load — recommended for duty cycles of 40% or higher. Holding the intake valve open lets cool air circulate through the cylinder while unloaded, lowering internal temperatures and reducing wear on the motor and magnetic starter.

Dual-bolt belt tensioner

The dual-bolt belt tensioner sets precise belt alignment and tension without pry bars, reducing wear for longer belt life and easier service.

Pump-mount riser

The pump mounting riser lifts the pump for 360-degree airflow from the flywheel across the oil reservoir and underneath the pump, improving cooling.

What's Included

This is a complete packaged air system:

• EMAX Silent Air 7.5 HP two-stage vertical air compressor with 80-gallon tank
• 30 CFM refrigerated air dryer with built-in prefilter (.001 micron) and coalescing prefilter (.005 micron)
• Dual-timer electric automatic tank drain with air muffler, adjustable from 1 to 45-minute cycles
• Magnetic starter
• Pump-mount riser and dual-bolt belt tensioner

Specifications

Warranty

Compressor: 1-year standard warranty against defects in material, workmanship, and parts from the date of delivery, including one year of warranty labor from an authorized technician. Coverage extends to a full 5 years when you register the unit and follow the required maintenance using EMAX SMART OIL.

Refrigerated dryer: 1-year standard warranty from the date of delivery, extendable to 3 years with registration and the recommended annual filter maintenance.

Initial break-in oil must be changed within the first 70 hours of run time; after that, change the oil every 6 months or 1,000 hours, whichever comes first. The EMAX EFKIT008AWBS service kit (sold separately) supplies the SMART OIL and maintenance components specified for the extended-warranty schedule.

FAQ

What power does this compressor require?

It runs on 460V three-phase power with a recommended 20-amp circuit. Full-load current is 10.3 amps at a 1.15 service factor, and a magnetic starter is included.

Can it run continuously?

Yes. The unit is rated for continuous run at a 60% duty cycle, and the head unloaders let the motor keep running at pressure rather than cycling on and off under load.

How loud is it?

The patented Silent Air intake silencer targets intake noise for operation up to 50% quieter than a comparable open-intake compressor, around conversational sound levels.

Does the dryer remove moisture?

The included 30 CFM refrigerated dryer removes moisture from the compressed air and adds a .001-micron prefilter and a .005-micron coalescing prefilter ahead of your air lines.

Documents

• Air Compressor Owner's Manual (PDF)
• Refrigerated Air Dryer Manual (PDF)
• Compressor Warranty Statement (PDF)
• Air Dryer Warranty Statement (PDF)

This compressor package ships crated via freight (crated 48" × 46" × 87"). To schedule delivery or confirm your shop's electrical and installation requirements, email sales@mygaragesupplies.com or call 307-381-1810.