Technical Information


Model RIS is tested and listed by Intertek Testing Services to the following standard:

UL 103HT - The standard for solid and liquid fuel chimneys.


RIS chimney is suitable for use on appliances that burn:

  • Wood
  • Oil
  • Coal
  • Natural or LP Gas
  • Charcoal

Model RIS is certified to vent wood burning stoves, fireplaces and residential furnaces. In addition, there are a number of RIS components specifically designed and certified to vent large open masonry fireplaces burning wood and/or gas. There are also specific components designed to extend masonry chimneys and repair earthquake damaged masonry chimneys.

Note for customers in Canada: Model RIS is not certified to the ULC S-629 Standard. Do not install an RIS system on a wood fireplace without first contacting your local authority for approval. ICC can provide complete engineering services (sizing, material selection, installation recommendations, drawings etc.) to assist you in obtaining approval. However, we can not guarantee that it will be accepted in all cases. If you have a large fireplace project you would like to quote on please be sure to contact us in advance so we can work with your local engineer, architect and building authority.

Allowable Flue Gas Temperatures

Max Continuous 650°C (1000°F)

Brief Forced Firing 925°C (1400°F)

Tested To 1150°C (2100°F)

Clearance to Combustible Materials

Model RIS is certified for 2” clearance to combustible materials.



.018” - .025”, stainless steel.


.018” - .025”, stainless steel or

.018” - .025” galvalume steel.


Interior and exterior seams are continuous seam welded.


Thermoplus continuous blanket.

Wall thickness:


Intertek RIS EN