Page 12 of Copperfields 2006 '2007 CATOLOG
HOMESAVER ROUND FLEX
UL Listed to OL 1777 for solid fuel with one wrap of 1/4" Foil-Faced Flex Wrap
UJ lListed To UL 1777 Zero Clearance for solid fuels with two wraps of 1/4" or one wrap of 1/2" Foil-Face Flex Wrap or minium of
1" Home saver Insulation Mix or TherMix ariund rhw pipe
Seems to me HomeSaver Round flex requires insulation to meet the UL 1777 listing without the insulation it is an unlisted liner and cannot be code compliant installation.
Again taken form Copperfields page 36 Top of the page
" Hi-Flex offers a lifetime warranty for wood burning applications, and is Listed to the Ul 1777 Standard for Zero Clearanceto Combustables when properly insulated
There are many parts to the UL 1777 tests. The Temperature Tests determine whether the exterior of the chimney will stay cool enough so that combustibles touching the chimney (i.e.: floor joists, attic rafters, etc.,) won't ignite. The temperature test for solid fuels (coal and wood) simulates a chimney fire.
Other tests that the liners must go through include the Vertical Support Test, Loading Test, Strength Test, Sweep Test, Abrasion Test, Torsion Test, Flexibility Test and Rain Test. After passing all of these tests, the manufacturer must then work with UL for approval on their written installation instructions.
To have a truly UL Listed product, it must be subjected to Underwriters Laboratories for testing and later for their suprise visits to the manufacturing facility, and of course, the product must bear the UL trademark . Some companies test to UL Standards by another testing laboratory. Their product can't be UL Listed because UL didn't do the test. They often advertise as "Listed to UL 1777".
The only standard for chimney liners is UL 1777
As an inspector it is my job to see that the labeling and listing of the appliance and venting is followed to satisfy the maunfactures specs. I reqiure the manufactures specs of both the stove and any venting components to review what is required before I issue a permit.. What is required is all appliances. be it a bath fan or woodstove insert, to be properly labled and listed.
301.4 Listed and labeled. Appliances regulated by this code
shall be listed and labeled for the application in which they are
installed and used,
301.5 Labeling. Labeling shall be in accordance with the procedures
set forth in Sections 301.5.1 through 301.5.2.3.
301.5.1 Testing. An approved agency shall test a representative
sample of the mechanical equipment and appliances
being labeled to the relevant standard or standards. The
approved agency shall maintain a record of all of the tests
performed. The record shall provide sufficient detail to verify
compliance with the test standard.
301.6 Label information. A permanent factory-applied
name-plate(s) shall be affixed to appliances on which shall
appear in legible lettering, the manufacturer’s name or trademark,
the model number, serial number and the seal or mark of
the approved agency..A label shall also include the following:
3. Fuel-burning units: Hourly rating in Btu/h (W); type of
fuel approved for use with the appliance; and required
clearances.