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Rectangular EPDM flexible connections - Model 511 and 512 industrial grade, all welded construction - dB Noise Reduction



  • Fan inlets and outlets
  • Pressure blower inlets and outlets
  • Baghouse inlets and outlets
  • Scrubber inlets and outlets
  • Dryer outlets
  • Stack inlets
  • Gas turbine intake systems
  • Ventilation and process ductwork

Model 511 rectangular EPDM
flexible connections

  • Tough, 1/8" thick, layered EPDM flex membrane with internal nylon scrim for superior tear strength
  • Resistance to ozone and UV exposure, and cold cracking makes it ideal for outdoor use
  • Good for airstream flows to 6,000 fpm and pressures from -30" wg to +120" wg
  • All welded, matched and drilled flanges
  • Backing bars fastened in place with zinc plated hardware

Model 512 rectangular EPDM
flexible connections

  • Identical construction to Model 511 flexible connections, with an aerodynamically designed, protective metal flow liner
  • Good for airstream flows over 6,000 fpm and pressures from -120" wg to +120" wg (with a flow liner)
  • Double deflectors are also available for extra flow protection and noise reduction
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Rectangular EPDM flexible connections

Rectangular EPDM flexible connections - features - dB Noise Reduction   Rectangular EPDM flexible connections - detail - dB Noise Reduction

Rectangular EPDM flexible connections features - dB Noise Reduction

Product details

Operating temperatures:

Up to 225° F


Up to 6,000 fpm (Model 511)
Over 6,000 fpm (Model 512)


-30" wg to +120" wg (Model 511)
-120" wg to +120" wg (Model 512)


From 12" X 12" inside to 120" X 120"
inside (standard) - Larger sizes available

Flange-to-flange length:

8" for flanges less than 4"
10" for flanges 4" and larger

Lateral and axial movement:

+/- 0.5"

Unit weight:

Up to 700 lbs (standard sizes)


Carbon steel flanges, backing bars and flow liner
(if supplied), zinc plated backing bar hardware and
EPDM flex membrane

Stainless steel flanges, backing bars, flow liners
and hardware available

Galvanized construction also available

Paint finishes:

Alkyd, enamel, high heat, inorganic zinc, epoxy
and polyurethane

For other customized flexible connection designs, please contact us and we will be happy to assist you.


Servicing clients in the US, Canada, Mexico, and many international locations worldwide.