NegarraMDWTwin wall insulated multi-fuel stainless steel chimney system

25mm cavity with high density insulation for rapid stabilisation of flue temperature and draught

Internal and external applications

1500mm lengths now available to reduce cost and installation time

T600 N1 D V2 L50040/50 G65 T600 N1 W V2 L50040/50 G65T450 H1 W V2 L50040/50 O65

Manufactured and approved to European Standard EN1856-1 with designations

316L inner liner material specification and 304L outer liner material specification with 10 year warranty

Specialist distributor of flues, chimneys & renewable appliances

www.docherty.co.uk

approved

Negarra MDW is a twin-walled insulated stainless steel chimney system designed and approved for use with all fuels including gas, oil and approved solid fuels.

Welcome toNegarra

NegarraMDW

NEGARRA is a specialist manufacturing company producing a wide range of flue and chimney products that are installed worldwide.

Mission, vision and valuesNEGARRA is a truly customer focused business, and we take pride in our commitment to continually improve.NEGARRA innovation is defined as taking on the impossible, doing the unconventional and delivering the products our customers want - when they want them.

QualityOur products are manufactured to the highest possible quality and safety standards and approved, where applicable, to the relevant European standard. A robust quality management system is in place to ensure that these standards are adhered to.

NEGARRA policy is to minimise our effect on the environment by managing the way in which we provide services to our customers.

Negarra has developed MDW to meet the requirements for a wide range of applications and a variety of fuels. MDW is suitable for traditional negative draught appliances as well as modern high efficiency condensing appliances. The range is the ultimate in design engineering and is CE approved and certified to European Standard EN 1856-1 with designations:

DistributionNegarra MDW is exclusively available in the UK through the Docherty Group, the largest specialist flue and chimney distributor with eleven branches strategically located around the country; further details can be found on the back

of this brochure.

www.negarra.es

2

T600 N1 D V2 L50040/50 G65 T600 N1 W V2 L50040/50 G65T450 H1 W V2 L50040/50 O65

Material Specification and WarrantyThe inner liner is manufactured from 316L grade stainless steel and the outer liner from 304L grade stainless steel. The product is supplied with a ten year conditional warranty.

DescriptionNegarra MDW is a twin-wall insulated stainless steel chimney system incorporating lengths, bends, tees, and terminals. The 25mm cavity is filled with high density insulation, providing a high level of thermal resistance to ensure rapid stabilisation of flue gas temperature and draught. Negarra MDW is suitable for use with multi-fuel appliances including wood and mineral fuels. It is also suitable for condensing applications at lower temperatures by the introduction of o-ring seals - available as an optional extra.

DimensionsNegarra MDW is available in a comprehensive range of diameters suiting all applications from 125mm to 250mm.

ApprovalNegarra MDW is manufactured and approved to the latest European Standard EN1856-1.

3

NegarraMDWMDW can be supplied painted to any BS or RAL colour.

125mm and150mm diameter MDW is available ex-stock, powder coated matt black.

Components

4

Single Wall toMDW Adaptor

Diameter (Ø)

Stub length (L)

Code

125mm

60mm

720151W

150mm

60mm

721151W

175mm

60mm

722151W

200mm

60mm

723151W

250mm

60mm

724151W

Long Tapered AdaptorNot to be fitted directly to the appliance

Diameter (Ø)

Length (L)

Code

125mm

980mm

720250W

150mm

980mm

721250W

175mm

980mm

722250W

200mm

980mm

723250W

250mm

980mm

724250W

Short Tapered AdaptorNot to be fitted directlyto the appliance

Diameter (Ø)

Length (L)

Code

125mm

82mm

720149W

150mm

82mm

721149W

175mm

82mm

722149W

200mm

82mm

723149W

250mm

82mm

724149W

MDW to Single Wall Adaptor

Appliance Adaptor Increaser

Diameter (Ø1-Ø2)

Stub length (L)

Code

100-125mm

170mm

720157W

125-150mm

170mm

721157W

150-175mm

170mm

722157W

175-200mm

170mm

723157W

200-250mm

170mm

724157W

Ø

L

Ø2

Ø1

L

Ø

A

B

Ø

L

Ø

L

Diameter (Ø)

Length (A)

Height (B)

Code

125mm

120mm

50mm

720251W

150mm

120mm

50mm

721251W

175mm

120mm

50mm

722251W

200mm

120mm

50mm

723251W

250mm

120mm

50mm

724251W

Visit www.planningportal.gov.ukfor current Building Regulations

Installation Instructions Negarra MDW must only be installed by a competent approved installer and in accordance with detailed installation instructions which are available on request or can be downloaded from our website.

For additional technical information contact sales@docherty.co.uk or call 01635 292400

5

Adjustable Lengths

Nominal length

Effective length (L)

Ø125mm

Ø150mm

Ø175mm

Ø200mm

Ø250mm

250mm - 450mm

215mm - 415mm

720108W

721108W

722108W

723108W

724108W

500 - 950mm

465mm - 915mm

720107W

721107W

722107W

723107W

724107W

Nominal length

Effective length (L)

Ø125mm

Ø150mm

Ø175mm

Ø200mm

Ø250mm

100mm

65mm

720103W

721103W

722103W

723103W

724103W

250mm

215mm

720104W

721104W

722104W

723104W

724104W

500mm

465mm

720105W

721105W

722105W

723105W

724105W

1000mm

965mm

720106W

721106W

722106W

723106W

724106W

1500mm

1465mm

720101W

721101W

722101W

723101W

724101W

15o Elbow Diameter (Ø)

Height (A)

Offset (B)

Code

125mm

138mm

15mm

720015W

150mm

139mm

15mm

721015W

175mm

143mm

16mm

722015W

200mm

148mm

16mm

723015W

250mm

152mm

17mm

724015W

30o Elbow Diameter (Ø)

Height (A)

Offset (B)

Code

125mm

151mm

34mm

720030W

150mm

157mm

36mm

721030W

175mm

163mm

38mm

722030W

200mm

170mm

39mm

723030W

250mm

182mm

43mm

724030W

45o Elbow Diameter (Ø)

Height (A)

Offset (B)

Code

125mm

158mm

57mm

720045W

150mm

167mm

61mm

721045W

175mm

175mm

65mm

722045W

200mm

184mm

68mm

723045W

250mm

202mm

76mm

724045W

Straight Lengths

Ø

A

B

Ø

L

Ø

L

Ø

A

B

Ø

A

B

A

B

A

B

Components6

100mm Connecting Length

250mm Connecting Length

500mm Connecting Length

1000mm Connecting Length

1500mm Connecting Length

Diameter (Ø) 125mm 150mm 175mm 200mm 250mm

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

336mm

53mm

481mm

92mm

725mm

157mm

1209mm

286mm

1690mm

415mm

342mm

53mm

487mm

92mm

725mm

157mm

1210mm

286mm

1693mm

416mm

347mm

54mm

492mm

93mm

734mm

158mm

1216mm

287mm

1699mm

417mm

358mm

56mm

502mm

94mm

744mm

159mm

1227mm

289mm

1710mm

418mm

367mm

57mm

511mm

96mm

753mm

162mm

1236m

290mm

1719mm

421mm

100mm Connecting Length

250mm Connecting Length

500mm Connecting Length

1000mm Connecting Length

1500mm Connecting Length

Diameter (Ø) 125mm 150mm 175mm 200mm 250mm

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

355mm

111mm

485mm

187mm

702mm

311mm

1134mm

561mm

1567mm

812mm

367mm

116mm

497mm

191mm

714mm

314mm

1147mm

566mm

1568mm

816mm

380mm

121mm

510mm

196mm

726mm

319mm

1159mm

569mm

1592mm

817mm

392mm

123mm

522mm

198mm

739mm

323mm

1172mm

571mm

1605mm

823mm

417mm

131mm

547mm

206mm

764mm

331mm

1197mm

579mm

1630mm

829mm

15o Elbowcombination offsetdimensions

30o Elbowcombination offsetdimensions

45o Elbowcombination offsetdimensions

100mm Connecting Length

250mm Connecting Length

500mm Connecting Length

1000mm Connecting Length

1500mm Connecting Length

Diameter (Ø) 125mm 150mm 175mm 200mm 250mm 300mm

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

Height (A)

Offset (B)

356mm

176mm

462mm

279mm

639mm

459mm

992mm

813mm

1346mm

1164mm

374mm

184mm

480mm

288mm

656mm

465mm

1010mm

818mm

1363mm

1172mm

391mm

191mm

497mm

295mm

674mm

470mm

1028mm

825mm

1381mm

1177mm

409mm

198mm

515mm

302mm

692mm

477mm

1045mm

833mm

1399mm

1186mm

444mm

213mm

550mm

317mm

727mm

494mm

1081mm

847mm

1434mm

1201mm

480mm

225mm

586mm

330mm

762mm

508mm

1116mm

860mm

1469mm

1217mm

A

B

connecting length

connecting length

connecting length

7

90o Elbow

90o Tee

135o Tee

Tee Cap

Tee Capwith Drain

Rain Cap

Ø

A

B

Diameter (Ø)

Height (A)

Offset (B)

Code

125mm

176mm

157mm

720090W

150mm

189mm

179mm

721090W

175mm

201mm

182mm

722090W

200mm

214mm

195mm

723090W

250mm

239mm

220mm

724090W

Diameter (Ø)

Height (L)

Centre (A)

Offset (B)

Code

125mm

285mm

143mm

143mm

720109W

150mm

315mm

163mm

163mm

721109W

175mm

355mm

178mm

178mm

722109W

200mm

380mm

185mm

190mm

723109W

250mm

430mm

215mm

215mm

724109W

Diameter (Ø)

Height (L)

Centre (A)

Offset (B)

Code

125mm

435mm

335mm

228mm

720110W

150mm

470mm

365mm

266mm

721110W

175mm

530mm

404mm

296mm

722110W

200mm

545mm

423mm

312mm

723110W

250mm

605mm

466mm

350mm

724110W

Diameter (Ø)

Height (A)

Width (B)

Code

125mm

151mm

240mm

118112W

150mm

155mm

260mm

119112W

175mm

166mm

310mm

120112W

200mm

190mm

360mm

121112W

250mm

201mm

410mm

122112W

Diameter (Ø)

Height (A)

Code

125mm

20mm

118113W

150mm

20mm

119113W

175mm

20mm

120113W

200mm

20mm

121113W

250mm

20mm

122113W

Diameter (Ø)

Height (A)

Code

125mm

20mm

118145W

150mm

20mm

119145W

175mm

20mm

120145W

200mm

20mm

121145W

250mm

20mm

122145W

Ø

A

Ø

A

B

A complimentary Tee Cap is supplied with Tees.

A complimentary Tee Cap is supplied with Tees.

Not to be used with solid fuels unless BS EN 15287 Part 1 is complied with.

Ø

A

Ø

A

B

L

Ø

A

B

L

Components8

Diameter (Ø)

Height (A)

Code

125mm

130mm

720111W

150mm

130mm

721111W

175mm

130mm

722111W

200mm

130mm

723111W

250mm

130mm

724111W

Top Stub/Conical Terminal

Anti-RainTerminal

Anti-WindTerminal

Anti-BirdTerminal

Flashing0o - 10o

Flashing5o - 35o

Flashing30o - 45o

Diameter (Ø)

Height (A)

Width (B)

Code

125mm

209mm

240mm

118123W

150mm

215mm

260mm

119123W

175mm

249mm

310mm

120123W

200mm

252mm

360mm

121123W

250mm

273mm

410mm

122123W

Diameter (Ø)

Height (A)

Width (B)

Code

125mm

162mm

288mm

118125W

150mm

165mm

313mm

119125W

175mm

164mm

338mm

120125W

200mm

164mm

363mm

121125W

250mm

166mm

412mm

122125W

Diameter (Ø)

Height (A)

Width (B)

Code

125mm

260mm

196mm

118127W

150mm

310mm

198mm

119127W

175mm

310mm

208mm

120127W

200mm

360mm

203mm

121127W

250mm

410mm

202mm

122127W

Diameter (Ø)

Height (A)

Base (B)

Code

125mm

90mm

461mm

118.129

150mm

90mm

485mm

119.129

175mm

100mm

518mm

120.129

200mm

100mm

541mm

121.129

250mm

130mm

620mm

122.129

Diameter (Ø)

Height (A)

Base (B)

Code

125mm

129mm

318mm

118.130

150mm

137mm

541mm

119.130

175mm

148mm

569mm

120.130

200mm

152mm

609mm

121.130

250mm

182mm

692mm

122.130

Diameter (Ø)

Height (A)

Base (B)

Code

125mm

140mm

620mm

118.147

150mm

160mm

620mm

119.147

175mm

173mm

620mm

120.147

200mm

182mm

620mm

121.147

250mm

182mm

753mm

122.147

For additional technical information contact sales@docherty.co.uk or call 01635 292400

A

Ø

B

A

Ø

B

Ø

A

B

A

Ø

A

B

A

B

A

B

Storm Collar

9

AdjustableWall SupportBracketSupports up to 10m MDW

AdjustableWall BracketNot load bearing

Base Support PlateSupports up to10m MDW

Support Plateand ClampUsed to support MDW at non-combustible floors.Supports up to 10m MDW.

Level SupportUsed to support MDW at floor level.Supports up to5m MDW.

Diameter (Ø)

Height (A)

Diameter (B)

Code

125mm

80mm

320mm

118.132

150mm

80mm

320mm

119.132

175mm

80mm

385mm

120.132

200mm

80mm

410mm

121.132

250mm

80mm

500mm

122.132

Diameter (Ø)

Offset (A)

Width (B)

Code

125mm

250mm

131mm

118.115

150mm

280mm

135mm

119.115

175mm

305mm

135mm

120.115

200mm

325mm

140mm

121.115

250mm

360mm

145mm

122.115

Diameter (Ø)

Height (A)

Code

125mm

110mm

720183W

150mm

110mm

721183W

175mm

110mm

722183W

200mm

110mm

723183W

250mm

110mm

724183W

Diameter (Ø)

(A)

(B)

(C)

Code

125mm

90mm

310mm

223mm

118.121

150mm

101mm

334mm

245mm

119.121

175mm

106mm

358mm

257mm

120.121

200mm

125mm

380mm

284mm

121.121

250mm

137mm

382mm

293mm

122.121

Diameter (Ø)

(A)

(B)

(C)

Code

125mm

385mm

54mm

30mm

118.182

150mm

410mm

45mm

30mm

119.182

175mm

435mm

45mm

30mm

120.182

200mm

460mm

45mm

30mm

121.182

250mm

510mm

45mm

30mm

122.182

Diameter (Ø)

Height (A)

Length (B)

Code

125mm

35mm

985mm

118.137

150mm

35mm

985mm

119.137

175mm

35mm

985mm

120.137

200mm

35mm

985mm

121.137

250mm

35mm

985mm

122.137

A

B

Ø

A

A

B

A

B

Ø

A

C

B

Ø

A

A

BC

Ø

Maximum distance between adjustable wall brackets is 3m.

To be used when connecting MDW to a lintel or pre-cast chamber.

Components10

Diameter (Ø)

Width (A)

Length (B)

Code

125mm

120mm

150mm

118.136

150mm

120mm

150mm

119.136

175mm

120mm

150mm

120.136

200mm

120mm

150mm

121.136

250mm

120mm

150mm

122.136

Diameter (Ø)

(A)

(B)

Code

125mm

178mm

250mm

720004W

150mm

203mm

285mm

721004W

175mm

228mm

321mm

722004W

200mm

253mm

356mm

723004W

250mm

303mm

427mm

724004W

Diameter (Ø)

Height (A)

Code

125mm

35mm

118.117

150mm

35mm

119.117

175mm

35mm

120.117

200mm

35mm

121.117

250mm

35mm

122.117

Diameter (Ø)

Height (A)

Code

125mm

113mm

118.135

150mm

113mm

119.135

175mm

113mm

120.135

200mm

113mm

121.135

250mm

113mm

122.135

Diameter (Ø)

Code

125mm

118.114

150mm

119.114

175mm

120.114

200mm

121.114

250mm

122.114

Diameter (Ø)

Code

125mm

231.175

150mm

232.175

175mm

233.175

200mm

234.175

250mm

235.175

Roof RafterSuportBracket

Guy WireBracket

‘O’ Ring SealTo be used when MDW is serving condensing appliances

Locking BandA complimentary locking band is supplied with each fitting

StructuralLocking BandDesigned to replace the complimentary locking band where additional support is required for offsets and external joints above eaves height

AdjustableWall Sleeve

Where the chimney passes through a wall, the opening must be lined with a wall sleeve. Negarra provides two options for wall thicknesses of 250mm to 350mm and 450mm to 550mm

Maximum supported length is 5m.

Increases unsupported length by 1m - page 14 refers.

DecorativeTrim PlateTo tidy the internal aperture where the chimney exits the wall at 45o

Diameter (Ø)

Height (A)

Code 250mm-350mm

Code 350mm-450mm

125mm

165mm

720244W

720247W

150mm

190mm

721244W

721247W

175mm

215mm

722244W

722247W

200mm

240mm

723244W

723247W

250mm

290mm

724244W

724247W

A

B

WT

Ø

45o

A

B

A

Ø

A

Ø

Where MDW passes through a combustible floor, a ventilated fire stop plate must be used both above and below the aperture. A support clamp supports the weight of the chimney on the upper fire stop plate. Both plates must be secured using 6mm screws. The aperture must be constructed to maintain 65mm distance from the outer wall of the chimney to combustible materials. The aperture must additionally be lined with a fire resistant board. All subsequent floors having combustible floors must be treated in this way.Chimney joints must not be positioned in the thickness of floor or ceiling joist spaces or within 50mm of floor or ceiling.

Firestops are supplied in packs to include both fire stop plates and a support clamp. Three options are available with the ceiling fire stop supplied galvanised, painted white or painted black.

11

space whereappliance is

installed

Ventilated FirestopsPacks

Installation of fire stop components

Installation of chimney and enclosure around a fire stop

Diameter (Ø)

(A)

(B)

Code - white

Code - black

Code - galvanised

125mm

192mm

376mm

720001W

720002W

720003W

150mm

218mm

410mm

721001W

721002W

721003W

175mm

243mm

424mm

722001W

722002W

722003W

200mm

269mm

450mm

723001W

723002W

723003W

250mm

NA

NA

724001W

724002W

724003W

occupied space

Combustible floor

Aperture lined with fire resistant board

Adaptor to MDW

30 minute fire rated enclosure

Support clamp

Minimum 65mm air gap

Combustible floor

Minimum 150mm

Vitreous connecting pipe

Aperture lined with fire resistant board

Minimum 65mm airgap from the outer casing of the flue to the inner surface of a 30 minute fire rated enclosure

B

BA

Components12

Carbon Monoxide AlarmIn rooms where a solid fuel appliance is installed it is a legal requirement to fit an audible CO alarm conforming to BS EN 50291, positioned in accordance with Building Regulations Approved Document J.

NEGARRA MDW chimney systems are manufactured to the highest quality standards. Under normal operating conditions, NEGARRA MDW provides many years of reliable service and carries a 10 year conditional warranty depending on application, installation and maintenance.

The components within the range can be vulnerable when exposed to the products of combustion from solid fuel appliances and this is especially true for terminals. Condensate collectors are also vulnerable, particularly if the flue system is not regularly maintained and cleaned.These components are considered ‘incidental‘ and their life expectancy will vary depending on location, application, fuel usage and maintenance. For this reason, these fittings are covered by a 2 year warranty and not the 10 year conditional warranty.NEGARRA MDW chimney system carries a 10 year conditional warranty for any defect due to faulty manufacture, this is provided the system has been installed in accordance with NEGARRA installation instructions, and has been used for the purpose it was designed for. Furthermore, the system must be regularly cleaned, maintained and inspected. This should be carried out at least once per year, and more regularly if the appliance is used continuously or frequently, by a member of one of the HETAS recognised chimney sweep associations (APICS, GMCS or NACS) or a HETAS Approved Engineer. Written documentation to demonstrate the inspection and cleaning of the chimney must be kept to validate the ten year warranty.When burning mineral fuel or smokeless fuel in your appliance, care should always be taken to use a high quality fuel. Only HETAS or SFA (Solid Fuel Association) approved fuels must be used with NEGARRA MDW. For guidance on fuel choices please visit www.hetas.co.uk.Under no circumstances should an appliance be located where there is the potential of chemical contamination of the combustion air.Where the chimney system is exposed to severe coastal locations, you must ensure adequate protection to the outer components of NEGARRA MDW.A chimney fire will invalidate the warranty; in the event of a chimney fire it is always advisable to replace the complete chimney system.

Warranty terms and conditions

13

Installation GuideAlso see illustrations pages 14-15

MDW must only be installed by a competent approved installer and in accordance with the full installation instructions that are available on request.

Chimney and flue designThe chimney and flue design is the responsibility of the engineer or installer and should conform to the requirements of Approved Document J and, where appropriate, BS EN 15287 part 1.Any variation will require the designer to ensure the performance of the chimney meets the requirements of the appliance by calculation using the methods given in BS EN 13384 part 1 or any proprietary software program based on this standard.

Regulations and standardsThe regulations and standards covering the design and installation of a chimney system in the UK are as follows:

Building RegulationsEngland and Wales -- Approved Document J - Combustion Appliances and Fuel Storage Systems.Scotland -- Scottish Building Standards Technical Hand Book Section 3.Northern Ireland – Building Regulations Part L – Combustion Appliances and Fuel Storage Systems.

StandardsBS EN 15287 part 1 - Chimneys. Design, installation and commissioning of chimneys Part 1: Chimneys for non-room sealed heating appliances.BS EN 13384 part 1 - Chimneys. Thermal and fluid dynamic calculation methods.

Flue sizingThe sizing of flues for appliances should be based on the type of fuel and the appliance to be used.• Gas AppliancesIn the case of gas appliances the Building regulations Approved Document J table 5, the gas safety in use regulations and in all cases as required by the manufacturers’ installation instructions.• Oil AppliancesFlues for oil appliances should be sized in accordance with the requirements of Approved Document J Paragraphs 4.4 and 4.5.• Solid Fuel AppliancesThe size of flues for solid fuel appliances should be in accordance with the requirements of Approved Document J Paragraphs 2.4 to 2.7 and as given in table 2 of ADJ.For solid fuel appliances with back or side flue outlet, the maximum permitted length of horizontal chimney or flue pipe is 150mm.

Where the chimney passes through a wall, the opening must be lined with a wall sleeve.The termination height of the chimney will depend on appropriate regulations and standards.The connection between a connecting flue to MDW must be made in the same room as the appliance. According to the UK Building Regulations, the chimney must be accessible for inspection and cleaning. We recommend the inclusion of a tee to provide easy access.Each chimney section and connected fittings shall be used as manufactured for assembly on site without any alteration. Please make sure that all elements are installed the right way up.The system must be adequately supported with elements supplied by NEGARRA. The support components must be used at intervals depending on the load bearing criteria quoted on pages 14 and 15. Wall brackets are not load bearing and should be used to provide lateral stability only, and at intervals not exceeding the criteria quoted.Where the chimney passes through a combustible floor a ventilated fire stop plate must be used both above and below the aperture. A support clamp supports the weight of the chimney on the upper fire stop plate. Both plates must be secured using 6mm screws. The aperture must be constructed to maintain 65mm distance from the outer wall of the chimney to combustible materials. The aperture must additionally be lined with a fire resistant board. All subsequent floors having combustible floors must be treated in this way.Chimney joints must not be positioned in the thickness of floor or ceiling joist spaces or within 50mm of floor or ceiling.Where the chimney passes through any occupied space other than the room in which the appliance is installed, it must be fully enclosed with fire resistant material maintaining the 65mm clearance to the outer wall of the chimney. The enclosure is to prevent damage to the chimney, to prevent human contact and to ensure no combustible material can be placed too close to the chimney. The enclosure must have an access panel measuring at least 10,000mm2.Where the chimney passes through a roof space, it is essential that it is adequately supported by bracing to roof timbers. If there is a chimney run of more than 1.5m from the ceiling support to the roof support, use a bracing bracket and rigid stays for such application. Also, provision must be made to ensure that no accidental placement of combustible product can occur within 65mm of the external casing of the chimney. For example, a mesh or screen around the chimney. This must cover the first 1m of the chimney and must go down to the upper face of the ceiling. Any change of direction in a flue will create resistance to the flue gas movement. Building Regulations do not allow any part of the chimney system to form an angle greater than 45 degree from the vertical. Where the system is used for solid fuels and oil, no system can be constructed with more than two separate offsets in the chimney. If a 90 degree tee is used on the back of the appliance, this constitutes one offset. The length of chimney between two elbows must not exceed 20% of the total length of the chimney.

NegarraMDW

Structural Locking Band When fitted increases unsupported length to 3.0 metres

Top Stub or Rain Cap

Adjustable Wall BracketMaximum distance between wall brackets 3.0 metres

30° Elbows

Adjustable Wall BracketMaximum distance between wall brackets3.0 metres

Length

Locking Band

135° Tee

Adjustable Wall Sleeve

Wall Support BracketSupports up to 10 metres of chimney

Tee Cap and Drain

Adaptor to MDW

45° Vitreous Elbow with Door

Vitreous Enamel Connecting Flue

Where a drain can be incorporated in the tee at the base of the chimney then a top stub should be used.Note: Rain water ingress can be reduced by use of a terminal where a drain cannot be included

It is not a requirement, but ideally 30° elbows should be used to form the offset as this reduces risk of blockage and corrosion of the inner skin

External Trim Plate

Internal Trim Plate

The use of a secured guy wire bracket can increase unsupported length by 1.0 metre

Standard Unsupported LengthMaximum 1.5 metres

Minimum height of 600mm before an offset

Full installation instructions on request

Structural Locking Band

Installation External Application14

15Installation Internal Application NegarraMDW

Storm Collar

Wire MeshShields chimney in loft space

Ventilated Fire Stop and Clamp

Length

Tee Cap

150mm maximum

Adaptor to MDW

Vitreous Enamel Connecting Flue

Roof Flashing

Rafter Support

Ventilated Firestop

Ventilated Fire Stop

90° Vitreous Tee

Ventilated Fire Stop and Clamp

425mm minimum

Locking Band

Fire Rated Board Around Aperture

Rain Cap or Top Stub

Where a drain can be incorporated in the tee at the base of the chimney then a top stub should be used.Note: Rain water ingress can be reduced by use of a terminal where a drain cannot be included

Must cover at least 1.0 metre above floor level

Minimum 65mm clearance from the outer casing of the chimney to the inner surface of a 30 minute fire rated enclosure

Minimum 65mm clearance to combustibles

Minimum 65mm clearance to rafters

Minimum 65mm clearance to combustibles

Must have access panel at least 100mm x 100mm

Adjustable Wall Support

Full installation instructions on request

Fire Rated Board Around Aperture

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Group Head Office Units 15/16 Colthrop Business ParkColthrop Lane, Thatcham Berkshire, RG19 4NB T: 01635 292400 F: 01635 201737 E: info@docherty.co.uk

The Docherty Group in the UK

www.docherty.co.uk

Specialist distributor of flues, chimneys & renewable appliances

Docherty GroupFlue House, 55 Woodburn RoadBirminghamWest Midlands, B66 2PUT: 0121 555 6789 F: 0121 555 6727

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Docherty GroupUnit 15, Robin Hood Street Ind. Est.off Alfred Street SouthNottingham, NG3 1GET: 01159 584734 F: 01159 502899

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Docherty GroupCrowley Road, SwalwellGatesheadTyne and Wear, NE16 3HET: 0191 488 1111 F: 0191 488 0088

Moving soon to:Unit 15, Kingsway InterchangeTeam Valley Trading EstateGateshead, NE11 0JY

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Docherty Group Flue House, Portway Trading EstatePortview RoadBristol, BS11 9LQT: 0117 982 8252F: 0117 982 8225

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Docherty GroupUnit C Station Yard, Coombe RoadNorbiton, KingstonSurrey KT2 7AZT: 020 8391 0093F: 020 8397 7687

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Docherty GroupUnits 15/16 Colthrop Business ParkColthrop Lane, Thatcham Berkshire, RG19 4NB T: 01635 292400 F: 01635 201737

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Docherty GroupUnit 20, Flightway Business ParkDunkeswell, Devon, EX14 4RDT: 01404 890098 F: 01404 891112

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Sure Fire Training ServicesUnit E, Fairview BuildingsHeage Road Industrial EstateRipley, Derbyshire, DE5 3GHT: 01773 570408 • 0345 260 0166F: 01773 745414 • 0345 260 0266E: info@surefire.org.uk

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Damian Tyrrell07771 654 897dtyrrell@docherty.co.ukPostcode areas: AB, CA, DD, DG, DH, DL, EH, NE, KY, KW, HS, IV, PH, PA, FK, G, ML, KA, SR, ZE, TD, TS

Darren Willetts07850 994 128dwilletts@dochertyco.ukPostcode areas: B, CV, DE, DY,HR, LD, ST, SY, TF, WS, WV, WR, GL

Jason Edwards07918 561431 jedwards@docherty.co.ukPostcode areas: BA, BS, CF, DT, EX, NP, PL, SA, TA, TR, TQ

Alan Smith07545 503575asmith@docherty.co.ukPostcode areas: BH, HA, OX, RG, SL, SO, SP, TW, UB, W, HP, SN

Sacha Aarons07974 975 444saarons@docherty.co.ukPostcode areas: BN, BR, CR, CT, DA, E, EC, GU, ME, N, NW, RH, SE, SW, TN, WC, PO, SM, KT

Andy Bishop07595 205 268abishop@docherty.co.ukPostcode areas: AL, CM, CO, IG, IP, MK, NN, NR, PE, RM, SG, SS, EN, LU, CB, WD, NG, LE

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Area Sales Managers

Docherty Group Unit 7, Overland ParkGelderd RoadLeeds, LS27 7JNT: 01132 381200 F: 01132 381044

Docherty GroupUnit 2, Rivington CourtHardwick GrangeWarrington, WA1 4RTT: 01925 807950 F: 01925 807959

Marc Foster07918 561430 mfoster@docherty.co.ukPostcode areas: BB, BL, CH, CW, FY, IM, L, LA, LL, M, OL, PR, SK, WA, WN

Sam Lowe07966 471 139slowe@docherty.co.ukPostcode areas: BD, HD, HG, HU, HX, LS, WF, YO, S, LN, DN

Adina Heating ProductsUnit C, Fairview BuildingsHeage Road Industrial EstateRipley, Derbyshire, DE5 3GHT: 01773 571 330 F: 01773 367 989 E: sales@adinaheating.co.uk

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