HMF, SMF & BMF Media Filters

Pre-engineered HVAC Filtration Solutions

Self-cleaning, packaged filter systems designed to save you time and money


• Packaged, skid-mounted systems for easy plug-n-play installation
• Economical design
• Quick shipping for standardized packages
• Standard product submittals prepared and immediately available
• High quality, industrial grade components for long-term reliability
• Multiple offerings for a wide variety of applications
• Custom systems are available upon request

Filter Operation

Water from the system is pumped through the over-drain assembly at the top of the filter tank and distributed evenly over the media (media not shown in image below). Unfiltered water flows downward through the filter media where suspended particles are trapped. The filtered water then passes through the vessel and out the under-drain assembly at the bottom of the filter and returns to the system. Precision slots cut in the under-drain prevent the passage of media to the outlet. When the trapped particles cause the pressure differential across the media bed to reach a pre-determined pressure (approximately 16 psi), flow is reversed through the tank by repositioning the valves. The media is backwashed with a rigorous scouring action, releasing trapped particles within the media. The dirty water passes from the filter vessel through the over-drain assembly at the top of the vessel and flows to drain. After the backwash cycle, the filter valves
are again repositioned and the filtration cycle is resumed. The filter uses system water for backwash.The mechanical nature of the system guarantees an immediate improvement in water quality.

Standard Package Components

1. Over-drain assembly
2. Under-drain assembly
3. Waste outlet
4. Inlet
5. Outlet
6. Pressure gauges, 2.5” 0 -100 PSI
7. Mechanically linked valves
8. Electrically actuated Unitorq/Kitz ball valves (SMF), pneumatically actuated Bray butterfly valve (BMF & HMF) valve
9. PVC Shedule 80 face piping
10. Scot pump, cast iron, standard fitted, end suction, centrifugal, with TEFC close-coupled motor
11. System water backwash
12. Air release valve, Barak (BMF & HMF), brass (SMF)
13. NEMA 4X control panel enclosure, UL certified, 460V AC, 3-PH, 60 Hz
14. Differential pressure switch
15. Media: 1/4” x 1/8” gravel and 0.5 quartz sand
16. C-channel 304 stainless steel skid (SMF & HMF), epoxy coated carbon steel I-beam skid (BMF)

HMF, SMF & BMF Media Filters Brochure

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