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Black flexible elastomeric 90-degree elbow pipe fitting with closed-cell foam

Nomaco Kflex

Nomaco Kflex 801-LRE-100358 90-degree elbow pipe fitting

SKU CH-WBQX-CQBHZ

Elastomeric 90-degree elbow insulation fits 3 5/8 inch pipe, operates from -297 to 220 degrees F with R-value 6 and flame spread 25

  • TypeTarps
  • Elastomeric Buna-N rubber/PVC resists flames with a 25 spread index
  • Closed-cell foam structure delivers R-6 thermal resistance across the fitting
  • 90-degree elbow form fits 3 5/8 in outside-diameter pipe runs
  • Operates continuously from -297 °F up to 220 °F
  • Antimicrobial and plenum-rated for safe indoor air-handling systems

3-5/8" Elastomeric 90-degree elbow

This Nomaco Kflex fitting is a pre-formed 90-degree elbow designed to insulate pipe bends. It uses closed-cell Buna-N rubber blended with PVC and carries a plenum rating. The insulation suits HVAC, refrigeration and industrial piping that requires thermal protection at changes in direction.

Installers needing plenum-rated bend insulation

The elbow fits a tube outside diameter of 3-5/8 inches with a one-inch wall thickness and an R-value of 6. It operates from minus 297 degrees Fahrenheit up to 220 degrees Fahrenheit and has a flame spread index of 25. Builders who need straight-run insulation, unslit sleeves or a different diameter should select another product.

Antimicrobial closed-cell foam changes maintenance

The foam resists microbial growth and is flame retardant, reducing the risk of contamination and fire spread inside ductwork. Its flexible, unslit form allows the installer to wrap the elbow around existing pipework without cutting the insulation open. These properties simplify compliance with plenum codes and long-term hygiene requirements.

Highlights

  • Elastomeric Buna-N rubber/PVC resists flames with a 25 spread index
  • Closed-cell foam structure delivers R-6 thermal resistance across the fitting
  • 90-degree elbow form fits 3 5/8 in outside-diameter pipe runs
  • Operates continuously from -297 °F up to 220 °F
  • Antimicrobial and plenum-rated for safe indoor air-handling systems

Specifications

BrandK-FLEX USA
TypeTarps

Questions about this item

What pipe outside diameter must I already have for the 3 5/8 in inside diameter elbow to fit?

The fitting is made for tube outside diameter 3 5/8 in, so the existing pipe must match that size exactly.

Will the Buna-N rubber/PVC material and 25 flame spread index meet the same plenum rating as my existing insulated runs?

Yes, the elbow is plenum rated with a flame spread index of 25 and antimicrobial, flame-retardant closed-cell foam.

After installation, how can I confirm the 90-degree elbow is performing within its -297 to 220 °F operating range?

Measure the surface temperature at the elbow during system operation; it should stay between -297 °F and 220 °F.

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