INSTALLATION : EXHAUST FLUE INSTALLATION
EXHAUST FLUE INSTALLATION
GENERAL NOTES (READ THIS FIRST) The GARN® WHS unit itself can be ordered in one of two venting options: horizontal or vertical exhaust. The two options can be setup in one of the following three configurations:
HORIZONTAL exhaust into metal barrel
HORIZONTAL exhaust with an External Vertical Tee
VERTICAL exhaust through the roof
GENERAL NOTES – FOR HORIZONTAL FLUE INSTALLATIONS Horizontally vented GARN® WHS units must use the 6 inch, double-wall DuraTech® UL-103HT product produced by DuraVent®. The reason that DuraTech® is required versus any other manufacturer is because a DuraTech® ring is factory welded to the unit. Only DuraTech® flue will screw into the factory welded ring. An 8 inch DuraTech® ring can be custom ordered if desired. GENERAL NOTES – FOR VERTICAL FLUE INSTALLATIONS Vertically vented GARN® WHS units are designed with a universal flue collar system. The universal flue collar will accept any manufacturer’s UL-103HT (US) or ULC-S629 (Canada) flue that is double-wall with packed insulation between the walls. The flue is set into the collar, connected to the collar with sheet metal screws, and then sealed with stove gasket/rope and hi-temperature silicone caulk.
FLUE TERMINOLOGY: CLASS A, UL-103HT, ULC-S629, WHAT DO THEY MEAN? Here is an explanation of some of the different terminologies used when talking about flue.
UL-103 is the “Safety Standard for Factory-Built Chimneys for Residential Type and Building Heating Appliances”. It’s a lab test that chimney manufacturers have to pass to say their flue can be used with a solid fuel burning device. The standard covers testing of two types of factory-built flue:
1. A flue that allows gas temperature up to 1700°F (UL-103 flue) 2. A flue that allows gas temperatures up to 2100°F (UL-103 HT flue)
HT simply indicates that the chimney is rated for higher temperature operation (up to 2100°F intermittent). Class A is older terminology, but it still hangs around as an industry standard term. It’s basically like saying “Kleenex” or “Xerox”. Intertek (HY-C® Company’s safety listing company) stipulates that the terms “UL-103 HT” and “ULC-S629” flue must be used instead of “Class A”. ULC-S629 is a Canadian standard that is essentially equivalent in purpose to UL-103. It is the “Standard for 650°C (1200°F) Factory-Built Chimneys” that applies to solid fuel burning devices (such as wood burning). GARN® units have been safety tested and listed in the US and Canada to use UL-103HT flue product, but some areas in Canada specifically require the ULC-S629 marking on the flue.
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GARN® WHS 1000 and WHS 2000 Manual | © HY-C® Company LLC | October 2024
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