® DuraStack DIS/DAS Installation Instructions A Modular Double-Wall Positive Pressure Chimney System. Factory Built for Boiler Breeching, Engine Exhaust, and Chimney Stack.
A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE THAT POLYPRO® BE INSTALLED ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS. Warning CARBON MONOXIDE POISONING HAZARD. Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.
For the most up-to-date installation instructions, see www.duravent.com CONTENTS DuraStack DIS/DAS Double Wall Construction Positive Pressure Chimney System Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 4 Testing/Listing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 4 Section A: General Information . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .
INTRODUCTION DuraVent Model DuraStack DIS or DAS Chimney are cylindrical, prefabricated, modular venting systems incorporating a unique extended inner flange designed for both quick assembly and pressure sealing capability. Model DIS incorporates a 2” of mineral fiber insulation while DAS is air insulated. The circular cross section and high quality stainless steel inner flue construction provide for a system with high strength-toweight ratio and low friction losses.
Appliances and Low Heat Appliances as described in the Chimney Selection Chart of National Fire Protection Association (NFPA) Standard NO. 211. UL 103 1400°F Chimney Listing: Under this category, models DIS and DAS have been determined suitable for venting flue gases at temperatures not exceeding 760°C (1400°F) under continuous operating conditions from gas, liquid, oil or solid fuel fired appliances. Also complies with brief operation (maximum 10 minutes) at temperatures not exceeding 906°C (1700°F).
walls of combustible construction, if the conditions above are met. 3.
Effective Length When assembling two parts together, the joint will overlap 5/8”. So effective length is nominal length minus 5/8”. Effective Length Example Table 3 DIS Minimum Openings Model Roof / Floor (C) Wall (C) Ø5" - Ø10" Inside Ø + 8" Inside Ø + 8" Ø12" - Ø36" Inside Ø + 8" Not Listed Material L36 35 3/8" L24 23 3/8" L18 17 3/8" Table 4 DAS Minimum Openings Model L12 11 3/8" Clearances DIS Minimum air space clearance to combustible construction to model DIS Chimney is 1”.
CHIMNEY AND FITTING JOINT ASSEMBLY All components have a male and female end. The installation orientation is indicated on the labeling of each chimney section with an arrow. The arrow indicates the direction of the flow. Clean all inner and outer surfaces of the male and female ends with an appropriate organic solvent, such as acetone, Mek, or other commercial degreaser. 1.
Table 5 caution Sealant Usage DO NOT ALLOW SCREWS TO PENETRATE THE INNER FLUE. THIS CAN CAUSE CORROSION, GAS LEAKAGE OR EXPANSION FAILURE. NEVER USE SCREWS THROUGH THE OUTER CASING OF AN ADJUSTABLE LENGTH OR EXPANSION JOINT. OBSERVE ADEQUATE SAFETY MEASURES WHEN USING A DEGREASER. Interior Installation Sealant Application Supplier Joints DuraVent S-650 Red 650°F Inner Flue DuraVent S-2000 White 2000°F Color Max. Temp. Model Color Max. Temp.
Support Methods and Height Limits 1. Several support and guiding methods are used to anchor a chimney against upward, downward and angular displacement. 2. These supports and guides used with thermal expansion devices, prevent bending stresses on the chimney elbows and joints. 3. Supports and guiding methods and installation are described in Section C. Certain limitations apply for proper installation of supports and guides. See Tables 6 and 7. Termination See Dim.
away from the locking band. It is essential that these parts be properly installed and provided with adequate support and guidance to prevent binding or excessive bending forces. (See detailed installation information contained on page 27, Thermal Expansion). Chimney Weight Chimney weight is given in pounds per foot of chimney for each diameter. It is important to know the weight of the chimney section for chimney support or guiding.
H Guy Cable * tensioners and roof anchors * (by others) H Brace 5' Max Support Expansion Length Guide Maximum Height - See Table 6 feet from any adjacent ridge, wall or parapet, the chimney shall terminate at minimum of 3 feet above the ridge, wall, or parapet. 3. Where chimney terminates at more than 10 feet from ridge, wall, or parapet, a minimum height of 2 feet shall be required above the ridge wall or parapet.
important If more than 1/4” of thermal expansion is expected between a stationary point and the tee, the use of an expansion length and a two axis support is recommended to minimize bending moments on the tee (see Figure 11 and Table 9). Table 9 Maximum Allowable Length Between Two Fixed Points w/o Expansion Length Gas Temperature Rise Maximum Length Expansion 200°F 12'0'' 0.25" 300°F 8'0'' 0.25" 400°F 6'0'' 0.25" 500°F 5'0'' 0.25" 600°F 4'0'' 0.25" 700°F 3'6'' 0.25" 800°F 3'0'' 0.
Stationary Fix Support 45° Tee Expansion Length Appliance Increaser Appliance Tee Cap Drain-Tee Cap Figure 15 Appliance ØB ØB 2" C Figure 13 6" 2" ØA ØA 45° Tee Y * See Table 10 Figure 16 45° Elbow Increaser Table 10 Tapered Increaser Height Expansion Length Step C 1" Diameter 2" Diameters 3" Diameters 4" 8" 12" Appliance Figure 14 45° TEE Y (TY) 1. This kind of tee is useful where the stack is located between two application or with a double exhaust system.
provides increases of one, two or three size. The height of the fitting varies depending on the diameters to be increased (see Figure 17). 3. The tapered increaser have the same load strength as a standard length, but the step increaser is a non-structural part and must be protected from axial and lateral load. Elbows 1. Elbows are used for changes in direction in horizontal or vertical portions of a chimney system. 2.
Offset * * See Table 11 Figure 19 Table 11 Minimum Offset 16 Ø 3° 15° 30° 45° 5" n/a 1 3/8" 3 5/16" 5 5/8" 6" n/a 1 7/16" 3 7/16" 5 15/16" 8" n/a 1 ½" 3 ¾" 6 ½" 10" n/a 1 9/16" 4" 7 1/16" 12" n/a 1 5/8" 4 ¼" 7 11/16" 14" n/a 1 11/16" 4 ½" 8 ¼" 16" n/a 1 ¾" 4 13/16" 8 7/8" 18" n/a 1 7/8" 5 1/6" 9 7/16" 20" n/a 1 15/16" 5 5/16" 10" 22" n/a 2" 5 5/8" 10 5/8" 24" n/a 2 1/16" 5 7/8" 11 3/16" 26" n/a 2 1/8" 6 1/8" 11 ¾" 28" n/a 2 3/16" 6 3/8
Table 12 Bracing DIS/DAS I.D. Framework Bracing 5" - 20" 3" x 2" x 3/16" 2" x 2" x ¼" 22" - 36" 4" x 2" x ¼" 3" x 3" x ¼" the anchor plate assembly must be coated with inner joint sealant. 6. There are two ways of assembling parts on the support. You may choose your method depending on your situation. 6.1 The first method consists of assembling two parts and the anchor plate on the side and then installing this assembly on the support structure.
3. Slide the plate of the anchor plate support over the coupling. 4. Apply a second bead of sealant on the plate around the male coupling where the flange of the female coupling of the next part will mate. 5. Place the second part over the plate. Make sure the sealant completely fills joints between the plate and the female coupling. 6. Use eight clamp flanges and bolts to tightly clamp the parts to the support. 7.
WALL SUPPORT (WS) 1. The wall support consists of an Anchor Plate and a prefabricated frame with mounting brackets and angled struts for bracing. 2. Used to support the chimney in vertical runs, it maintains the chimney at an adjustable distance between 2-1/2” and 7-1/2” from the wall (see Figure 25). 3. The maximum weight allowable on the wall support depends if the support is attached to a metal structure or a wood structure (see Table 6 for maximum chimney height). 4.
Freestanding = H max Wall Guide 6' to 10' MVS Wall Guide Do not install expansion length in this area Wall Guide MVS Expansion Length Figure 29 Wall Support I.D. + 8" (DIS) I.D. + 12" (DAS) Figure 27 I.D. + 8" (DIS) I.D.
Rail Trolley 4" Travel Thermal Expansion Direction Flexible Strap 2x Layer (By others) Band ROOF BRACE (RB) 1. The roof brace is used to stabilize the chimney where it extends more than 15’ above the roof. 2. It consists of one band (RB) and two braces (supplied by the installer). 3. To minimize loads induced by thermal expansion on braces and support, the maximum distance between the last fixed support and the band of the roof brace must be reduced to 5’. 4.
band on the chimney and tighten the band. Fix the braces to the roof at 120°. Make sure you have a rigid structure on the roof. GUY WIRE (GW) 1. The guy wire is used where the chimney extends more than 15’ above the roof. 2. It consists of a band designed to receive 3 guy wire (supplied by others) at 120° apart or 6 guy wire at 60° apart for diameter larger than 24”. The guy wires are fixed to the roof by mean of tensioner and anchor (also by others). 3.
Storm Collar Floor Guide or Ventilated Anchor Plate Sealant Flashing Combustible roof/floor Firestop Radiant Shield No joint or expansion length in this area 2" Clearances (DIS) 4" Clearances (DAS) half into the opening and fix it. d. Insert the chimney trough the opening of the wall firestop. Make sure there is no chimney joint or expansion length in the wall opening. e. The chimney section must be well supported and guided to prevent any load on the wall firestop.
SECTION E - TERMINATIONS, STARTING ADAPTORS, DRAIN LENGTH AND RELIEF VALVE STARTING ADAPTORS Single Wall Adaptor (SWA) 1. The Single Wall Adaptor is used as an appliance connector. It is designed to be clamped with a Retaining Band and a locking band over a shank type flue gas outlet. 2. First, slide the retaining band over the appliance outlet and tighten it with supplied bolt. (See Figure 37). 3.
DIS/CT, CT/DIS, DAS/CT, CT/DAS Adapter 1. Used to connect model DIS / DAS chimney to model CT chimney. See Figure 43. Insert the Coupling End Appliance Outlet Figure 39 Inlet OTHER ADAPTORS Female Single Wall Adaptor (FSWA) 1. The Female Single Wall Adaptor is used as a connector to specialised component or existing chimney connection. It is designed to be clamped with a Retaining Band and a locking band over a shank type flue gas inlet. 2.
3. Add a bead of sealant about 1/8” on the flange of the retaining band and one on the flange of the adaptor (SWA) and mate those two flanges together. Be sure to fill all the gaps with S-2000 sealant. (See Figure 38a and Figure 39a). 4. Tighten the Locking Band to hold and seal the adaptor in place. See Figure 40a for typical installation. Female ANSI Flange Adaptor (FFA) 1. The Female Flange Adaptor (FFA) is intended for use as a connection to a class 125 or 150 ANSI pipe flange. 2.
annular catch ring and a 1” NPT nipple extending through the outer casing for attachment of drain tubing. 3. The drain tubing should include a water trap of a height at least equal to the maximum expected operating pressure at the appliance outlet to avoid allowing flue gases to vent through the drain. See Figure 48. 4. Drain length should be installed indoors to prevent freezing. Better Draft Figure 45 RELIEF VALVE (DIS ONLY) Relief Valve (RV) 1.
the Adjustable Length (LA). 11. Spacing of guides and supports, when a thermal expansion part is used, should not be greater than that specified in Section A, Table 7. 12. Proper guiding and support of expansion parts often requires closer spacing. Flue Direction Relief Valve Tee 45 RV Anchor Plate in frame by others ANSI Female Flange Adapter Figure 49 4. Good installation requires that expansion greater that 1/4” must be compensated with either a bellow joint (LB) or an adjustable length (LA).
Flip Top Anchor Plate Ventilated 12" Long Length Minimum With Bellows Bellow Joint 3" Max Expansion Wall Guide Wall Support 12" Long Length Minimum With Bellows Bellow Joint 3" Max Expansion 12" Long Length Minimum With Bellows Wall Guide Wall Support Suspension Band Bellow Joint Suspension Band Fixed Support Bellow Joint Fixed Support Muffler Fixed Support 3" Max Expansion Relief Valve Fixed Support Engine Figure 50 29
Table 15 Maximum Run with Adjustable Length Between Two Fixed Points Operating Temp. (°F) Max Distance With One Adjustable Length (ft.) 200 200 300 133 400 100 500 80 800 50 1000 40 1200 33 1400 29 Bellows Expansion Joint and Adjustable Length in Horizontal Runs 1. Same guidelines apply as for vertical run with respect to expansion estimate and proper support and guiding with the use of Bellows Expansion Joint and Adjustable Length. BELLOWS EXPANSION JOINT (LB) 1.
Desired Length Figure 51 Figure 55 Desired Length Move Outer Casing Figure 52 Figure 56 Figure 53 Wrench Figure 54 Supplied Tool VARIABLE LENGTH 1. The variable length (LV) is used only to make odd lengths, it doesn’t compensate thermal expansion. See Figure 65 for typical location. 2. The variable length assembly includes a sliding flanged female coupling, a flanged retaining band, a locking band, a insulation band and split outer casing.
Graphite Packing Containing Ring Telescopic Outer Casing d. Slide down the female coupling over the male coupling of downstream part and fill the gap between the female coupling and the inner wall with S-2000 or S-650 sealant. See Figure 61. e. Slide down the retaining band to the female coupling to mate heir flanges and tighten the band. Then, install the locking band over those flanges. See Figure 62. f. Install the insulation over the inner wall (DIS only). See Figure 63.
Tighten the Bolts and Install the Locking Bands Install the Insulation (DIS only) Figure 63 SECTION G - GREASE DUCT APPLICATION (DIS ONLY) ACCESS Grease Duct installations require provisions for cleaning the interior of the duct. NFPA 96 clean-out requirements are as follows: 1. A clean-out must be provided at each change of direction except where the entire length of the duct can be inspected and cleaned from either the hood or the discharge end. 2.
Finishing Cone Adjustable Length Up to 6 inch w.c.
consulted regarding the need for fire protection or washdown systems be installed so that the coupling is at or above the horizontal centerline of the chimney. Grease Dam Drain Grease Dam Drain Figure 66 SQUARE TO ROUND ADAPTOR 1. When the hood is equipped with a square or rectangular collar, a square to round adaptor is needed to connect the round DIS chimney to the hood (See Figure 69). 2. The outside dimensions of the square end are slightly smaller than the hood collar.
(TC). The location of the access port in the tee is dependent on the orientation of the tee in the final installation. Access port location is coded as shown in Figure 70. Male Coupling No Tool Access Door - Removal for Inspection or Cleaning 1. Unscrew the six (6) wing screws with your hands and set them in a safe place during the inspection (See Figure 72). 2. Remove the outer door from the outer wall of the duct and set it in a safe place during the inspection (See Figure 73). 3.
Figure 72 Figure 75 Upblast Fan Figure 73 Screws (by others) Fan Adaptor Sealant Fan Curb Figure 74 Figure 76 5. Replace the INSULATION PAD over the inner door. 6. Replace the outer door. 7. Put back the six (6) wing screws and tighten them with your hands. FAN ADAPTOR PLATE (FAN) (DIS ONLY) 1. The fan adaptor is designed to connect to an upblast fan mounted on a roof curb.
2. When connected to an upblast fan (See Figure 76), the plate mounts on top of the fan curb which supports the fan housing. 3. The plate may be positioned off center within the curb provided that minimum clearance to combustibles is maintained. 4. In the event that the plate is positioned off center, trim off excess plate material to allow fan placement. 5. Secure the plate to the curb a minimum of three (3) places per side with minimum #8 x 1-1/4” wood screws. You will have to drill holes in the plate. 6.
Section H - Markings Safety Listing Labels - DIS and DAS 39
DuraStack 1 year Standard and 15 year Limited Warranty This M&G DuraVent 1-year Standard and 15-year Limited Warranty warrants your DuraStack™ DIS and DAS stainless steel multi-fuel double-wall insulated chimney systems (Product) to be free from defects in material and workmanship at the time of manufacture. This 1-year Standard and 15-year Limited Warranty includes all components and fittings.
Grease Duct (DIS) Limited Lifetime Warranty Industrial and Commercial Chimney and Venting Products Limited Lifetime Warranty This M&G DuraVent Limited Lifetime Warranty warrants your DuraStack™ – DIS stainless steel multi-fuel double-wall insulated chimney system (Product) in a grease duct application to be free from defects in material and workmanship at the time of manufacture when properly connected to and included as a part of a code-compliant commercial kitchen ventilation system for cooking appliances
