The QFFN Series are neoprene isolators used in floating isolated floor systems. These mounts offer low natural frequencies and are designed for air spaces from 1" to 4". The QFFN isolators are ideal for applications where improved isolation performance is required at a low cost. 

The design consists of two floor slabs - the floating or isolated wearing slab and the structural floor slab. The QFFN Series serve as a permanent load bearing resilient material that connects the two slabs and provides positive air gaps between the two floors. 

The QFFN Series combine simplicity with the long lasting performance of neoprene and very simple, low cost installation.

Features & Benefits

  • Low natural frequencies from 5.7 Hz provide superior isolation in small air spaces
  • Unit accommodates air spaces from 1” to 4” – providing excellent flexibility in a range of building applications
  • Sturdy, long-life neoprene elements offer simple, low cost installation


  • Commercial utility and HVAC space
  • Performing arts centers
  • Computer operation rooms
  • Entertainment, social event spaces and health clubs
  • Transportation depots
  • Hospitals and research facilities
  • Office and residential complexes


Spec Sheets

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The engineers we employ hold the highest industry-recognized credentials in structural analysis, elastomer development and system dynamics.


We are the first ISO accredited PCA ISO-17065, third-party certification body for special seismic certification of non-structural building components and their mounting configurations by the ICC’s International Accreditation Service.

Test & Measurement

We are the only ISO 17025:2005 Accredited Seismic Simulation Test Laboratory with a triaxial shake table owned and operated by California licensed Structural engineers.

Testing Services Update
DCL now offers Nuclear Qualification and Testing services.

In partnership with Greenberry Industrial, we now offer testing services that meet the requirements of ASME NQA-1.

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