RM Holz Flue Duct Expansion Joints

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Typical Applications

300-LT expansion joints can be used in wet or dry service up to 400 F and 5psig.

300-LT can be manufactured from Neoprene, EPDM or Chlorobutyl rubber and is reinforced with single of multiple layers of woven fabric or knitted wire.

300-LT expansion joints are typically found on baghouses, FD fans, wet or dry scrubbers and precipitators.

300-LT expansion joints are offered in either belt or flanged configurations and are designed to operate without a flow liner except where abrasion or high velocity flow is anticipated.

300-LT expansion joints are designed to allow external insulation over the flex element if desired.

400-LT can be used in wet or dry service up to 400F and 5psig.

400-LT is constructed using FKM rubber and is reinforced with a single of multiple layers of woven fabric or knitted wire. An additional FEP or PTFE gas barrier can also be added for increased chemical resistance especially in applications where ammonia slip is expected.

400-LT expansion joints are typically found on air heater gas
outlets, baghouses, precipitators, induced draft fans, wet or dry scrubbers and stack breeching ducts.

400-LT can also see excursion temperatures up to 750F in the case of air heater failure for a short duration without permanent damage to the elastomer.

400-LT expansion joints are offered in either belt or flanged
configurations and are designed to operate without a flow liner except where heavy abrasion is anticipated.

400-LT expansion joints are designed to allow external insulation over the flex element if desired.

500-T expansion joints are for use in wet or dry service up
to 575F and 5psig.

500-T is constructed from fiberglass reinforced PTFE with a zero porosity gas barrier of varying thickness ranging from 5mils to 30mils mechanically bonded to the substrate.

The 500-T is primarily used to provide the outer cover and gas
seal for high temperature composites but also can be used in
extreme chemical service as the primary flex element or inner
gas seal.

500-T can be found on applications ranging from paper processing liquors to wet scrubbers and economizer outlets as part of multi-layer solution.

500-T expansion joints require a flow liner in most cases if
used a single layer solution. Please contact Holz engineering regarding specific design considerations.