Ventinox® DuraFlex® Pro DuraFlex® SW DuraFlex® 316 DuraFlex® 304 TherMix® ProFoil® Flexible Chimney Liners Installation Instructions
A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE TO INSTALL ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS. IMPORTANT: Read through all of these instructions before beginning your installation.
For the most up-to-date installation instructions, see www.duravent.com CONTENTS Introduction; Inspecting and preparing the chimney. . . . . . . . . . . . . . . . . . . . . 4 Factory-Built Chimneys; Determining Liner Size . . . . . . . . . . . . . . . . . . . . . . . 5 Fitting Liners into Masonry Chimney; Tools & Supplies . . . . . . . . . . . . . . . . . 6 Preparing Thimble Area; Determining Liner Length. . . . . . . . . . . . . . . . . . . . .
READ THESE INSTRUCTIONS COMPLETELY BEFORE ATTEMPTING TO INSTALL Any DuraVent flexible CHIMNEY LINING SYSTEM INTRODUCTION DuraVent Flexible Chimney Liners are intended to service residential heating appliances burning wood, wood pellets, oil fuel, natural gas or propane gas (Category I or draft-hood equipped appliances), or other appliances listed for use with Type B gas vents.
DuraVent Chimney Liners: • The masonry chimney must have a wall thickness of at least 3.5 inches (4 in. nominal), a minimum height of 10 feet and maximum height of 100 feet. • In wood burning applications, the chimney must extend at least 3 feet above the highest point where it passes through the roof and at least 2 feet higher than any portion of the building within 10 feet. • Only one solid fuel heater may be connected into a flue and may not be combined to vent gas or oil burning appliances.
Oil burning equipment, CSA B139. Appliance(s) flue outlet must not be larger than the liner are at its smallest point, unless a qualified person has sized the liner to suit the appliance.It is very important that high efficiency appliances with low flue gas temperatures have correctly sized flue liners. Condensation within the flue system and improper venting/appliance performance can result, if flue liners are sized incorrectly.
Eye Protection Pliers Work Gloves Rope Dust Respirator Hack Saw Masonry Drill Bit(s) Ovalizing Machine DuraVent Flex Liners are available in 3, 4, 5, 5.5, 6, 7, 8, 9, 10, 11, and 12 inch diameters. Ventinox Liners can also be ovalized to assume many different cross-sectional shapes and areas. Ventinox® components are made from various stainless steel alloys. When ordering, match liner and component materials. Components are fastened to DuraVent Flex Liners by tightening the built-in draw band.
Typical system layouts for chimneys serving one or more Category I appliances.
DuraVent Flexible Chimney Lining Systems WITH A TEE AT THE THIMBLE Prepare the liner assembly. Slide the expanded end of the Tee body onto the liner and tighten the draw band. Attach the Tee Cap to the Tee Body in the same fashion. Do not attach the Tee Snout at this time. Note: DuraFlex SW® must be installed with the arrow imprinted on the liner pointing AWAY from the appliance! The rough side should face towards the appliance.
Ceramic Fiber Blanket Plug INSTALLING a DuraVent flex Liner IN FIREPLACE APPLICATIONS Seal the area at the top of the smoke chamber by lacing strips of ceramic blanket insulation with refractory cement and packing them tightly between the bottom of the liner and masonry (sealing plug). Keep the liner centered. Insulate 10 DuraVent Flex Liners from here to the top.
Tee or other adaptors. Seal chimney with a Damper Sealing Kit (see instructions for Stove and Fireplace Insert Installation Kits) or a sealing plug at the damper level or at the top of the smoke chamber. Alternatively, remove portions of the damper frame and smoke shelf so that a round DuraVent Flex Liner can be connected to the heater with a standard Tee, Sleeve, Boot or Adapter.
3) Masonry crowns with a clay tile and any UL listed rain cap: Fill TherMix® to within four inches from the chimney top. Slip a full or partial length of any standard clay tile over the DuraVent Flex Liner. Fill the gap between the outside of the tile with mortar or crown mix and form a slope to the outside of the top course of bricks. Fill the gap between the DuraVent Flex Liner and the tile with TherMix® and seal the last inch with mortar or crown mix.
Empty a TherMix® bag into a mortar trough or wheelbarrow. Add 7 to 9 gallons of water and mix with a hoe. Proper consistency is achieved when the material feels damp but is still granular. Little or no water should appear between fingers when a handful of TherMix® is squeezed. Correctly prepared TherMix® pours like “loose fill” into the void between the liner and the chimney. Complete instructions are on each TherMix® bag.
• Superior Performance: Featuring high “R” values, flue surface temperatures are balanced and react quickly to firing cycles of heating units. Aiding in optimal heating efficiencies. • Durable & Tested: When properly installed, TherMix does not leak, separate or deteriorate. Field tested since 1984. • Reinforces: Insulates the liner & flue gas while providing a strong bond for the masonry chimney.
Figure 1 TherMix Field Benefits TherMix Ceramic Blankets Zero-clearance to combustibles Yes Yes Ease-of-installation Yes Yes Difficulties with Offsets No Yes Seals dangerous cracks and voids in chimneys Yes No Eliminates air leakage into chimney Yes No Eliminates moisture buildup between liner & chimney structure Yes No Ships UPS/FedEx (Boxes Only) Yes Yes Accepted by building code officials Yes Yes Can be removed Yes Yes Avoids reliance on respirator during installation Yes
When using TherMix There is no need to purchase spray adhesives, tapes, wire, mesh, and/or sheet metal parts which add to the cost and time to complete a job (Figure 2.) • TherMix can be used to insulate modular masonry fireplaces. • TherMix stays in place when installed but can be easily removed. Dry weight per cubic foot installed is ~20lbs. TherMix is delivered in a strong poly-lined bag or box containing all ingredients except water, which must be added to moisten the material (Figure 3.
when the material feels damp but still granular (~7 to 9 gallons of water per bag/box). *When a handful of properly moistened TherMix is squeezed hard, little to no water appears between the fingers. During the installation, correctly prepared TherMix pours like “loose fill.” TherMix is distributed within the chimney cavity by vibrating the liner. *Do not tamp or compress TherMix.
DOUBLE WRAPPING 1⁄4” PROFOIL ProFoil Size Single Wrap Liner Size Double Wrap Liner Size 22”x 25” 3”-6” 3”-5” 24”x 25” 7” 6” 29”x 25” 8” 7”-8” 48”x 25” 9”-12” 9”-12” brand name, liner manufacturer, the date of installation and states the intended use of the particular DuraVent Flex Liner. After the installation is complete, make sure the appliances are venting properly.
Remove the Vertical Cap, or if working from the bottom, remove the appliance connector or clean-out cap. Select appropriately sized polypropylene chimney brushes and flexible fiberglass extension rods. Run the brush up and down inside the liner until any deposits or debris are removed. Reinstall the Vertical Cap, connector pipe or Tee Cap.
M&G DuraVent limited lifetime Warranty M&G DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used. DuraVent products are fully warranted if installed only by a professional installer.
