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The skeleton never changes. The duct is chosen for your gas.

Three duct specifications cover essentially the whole industrial exhaust range. The aluminium structure, guy system, base and installation method are identical in all three — so the choice in front of you is narrow, and it is entirely about what comes out of your process.

Specification selector

Three questions about the stream

The same three things an engineer would ask you on the phone. Everything runs in your browser — nothing is sent anywhere until you decide to send it.

Which duct fits your exhaust?

Answers update the recommendation live

Nothing is transmitted
Continuous exhaust temperature
Chemistry of the gas
Particulate carried in the gas

A recommendation from three questions is a starting point, not a specification. Send us the stream data and an engineer will confirm it — or tell you the selector was too optimistic about your application.

The three options

What each duct is made of, and what it is for

Option A Lowest installed cost

Silicone-coated E-glass

Silicone elastomer inside and out on a woven E-glass base. The right answer when the stream is warm rather than hot and the chemistry is undemanding — which describes most building services and light process exhaust. Specifying anything harder here is money spent on resistance you will never call on.

Base fabricE-glass woven, 500 g/m²
Inner coatingSilicone elastomer, 200 g/m²
Outer coatingUV-stabilised silicone
Continuous temperature230 °C / 446 °F
Peak temperature250 °C / 482 °F
UV resistance, xenon arc2,500 hr
Duct service life8–12 years
Duct replacement€1,175–2,775
Installed, 7 m × 1,000 mm≈ €9,000

Specified for

Commercial HVAC and building exhaust
Data centre generator stacks
Food and beverage process ventilation
Light industrial process exhaust
Hospital and laboratory general exhaust
Temporary and seasonal installations

Do not specify Option A for

Concentrated mineral acids, continuous operation above 230 °C, or streams carrying abrasive particulate. Those are Option B and C territory and silicone will not survive them.

Fabric supply

Suntex Composite Industrial · Heaterk · Taconic (USA, since 1961) · Precision Coating FTB. Multiple qualified sources, USD 5–55/m² depending on grade and origin.

Request an Option A quote →
Option B Most specified Best cost per year

PTFE inner, PVDF outer, E-glass base

Teflon® on the inside is chemically inert to essentially every acid an industrial process produces, and holds 260 °C continuously. Kynar® PVDF on the outside is architectural-grade weathering protection with 25 to 30 years of outdoor stability, which means no exterior maintenance across the whole life of the duct. Most industrial exhaust lands here, and it is where the cost-per-year is lowest.

Base fabricE-glass woven, 600 g/m²
Inner coatingPTFE (Teflon®), 400 g/m² min
Outer coatingPVDF (Kynar®), architectural
Continuous temperature260 °C / 500 °F
Peak temperature300 °C / 572 °F
UV resistance, xenon arc3,000+ hr
EN 1443 classificationT260 N1 W
Duct service life12–18 years
Duct replacement€1,913–8,200
Installed, 7 m × 1,000 mm≈ €12,500

Specified for

Chemical and petrochemical process exhaust
Pharmaceutical manufacturing ventilation
Acid fume exhaust — H₂SO₄, HCl, HNO₃
Spray coating and surface treatment
Biomass boiler and waste-to-energy exhaust
Industrial boiler and scrubber outlet stacks

Why this is the default recommendation

PTFE removes chemistry from the risk register almost entirely, and PVDF removes weathering. What is left is a duct with a 12 to 18 year life and no maintenance in between — which on a 20-year view beats both the cheaper and the more exotic option.

Fabric supply

Suntex (8001 grade) · Taconic standard · Precision Coating FTB · Saint-Gobain Performance Plastics · DERFLEX. Five qualified sources across Asia, Europe and the USA, USD 12–150/m².

Request an Option B quote →
Option C Abrasive plus chemical

ECTFE on para-aramid, PVDF outer

A Kevlar® para-aramid base with a Halar® ECTFE liner, for the streams that are chemically aggressive and abrasive at the same time — the combination that wears a glass-based fabric through from the inside. Rated to FM 4922. Note the trade-off honestly: ECTFE buys you abrasion and H₂S resistance, and costs you temperature.

Base fabricPara-aramid (Kevlar®), 750 g/m²
Inner coatingECTFE (Halar®)
Outer coatingPVDF (Kynar®), architectural
Continuous temperature150 °C / 302 °F
Acid resistanceStrong acids and H₂S
Abrasion resistanceBest of the three
Fire ratingFM 4922
Duct service life15–20 years
Duct replacement€6,005–11,590
Installed, 7 m × 1,000 mm≈ €17,500

Specified for

Metal etching and electroplating fume
Semiconductor manufacturing exhaust
Fly ash and abrasive particulate streams
Hydrogen sulphide bearing streams
Mineral acid scrubber outlet stacks

Two things to know before you specify it

ECTFE is limited to 150 °C continuous — above that with abrasive particulate, no catalogue option applies and we will work the problem with you. And Halar® is sole-sourced from Solvay, so lead time on a replacement duct is managed rather than assumed. We will tell you the current figure when you enquire.

Material supply

Solvay (Halar® ECTFE, sole global source) · DuPont Kevlar® or Teijin Twaron® base · Impreglon Group and Whitford Corp as coating applicators.

Request an Option C quote →
Complete data

Full specification table

Figures are for a 7 m installed height at 1,000 mm nominal internal diameter. Heights from 3 to 30 m and diameters from 200 to 1,500 mm are standard; anything outside that is an engineering conversation rather than a catalogue entry.

Prices are indicative, delivered and installed in Germany, and subject to project-specific engineering review. Ask us for a firm figure against your actual stream and roof.
Parameter Option A Option B Option C
Base fabricE-glass, 500 g/m²E-glass, 600 g/m²Para-aramid, 750 g/m²
Inner coatingSilicone, 200 g/m²PTFE, 400 g/m²ECTFE (Halar®)
Outer coatingUV siliconePVDF (Kynar®)PVDF (Kynar®)
Continuous temperature230 °C260 °C150 °C
Peak temperature250 °C300 °C170 °C
Acid resistanceDilute onlyExcellentOutstanding
Abrasion resistanceModerateGoodExcellent
UV resistance, xenon arc2,500 hr3,000+ hr3,000+ hr
Fire performanceEN 13501-1 Class EEN 13501-1 Class EFM 4922
EN 1443 classificationT230 N1 WT260 N1 WT150 N1 W
Duct service life8–12 years12–18 years15–20 years
Duct replacement cost€1,175–2,775€1,913–8,200€6,005–11,590
Skeleton materialEN AW-6082 T651EN AW-6082 T651EN AW-6082 T651
System mass, 7 m × 1 m≈ 38 kg≈ 40 kg≈ 46 kg
Heaviest single module14 kg14 kg15 kg
Guy wire system3 × 6 mm SS3 × 6 mm SS3 × 6 mm SS
Height range3–30 m3–30 m3–30 m
Diameter range200–1,500 mm200–1,500 mm200–1,500 mm
Installation time4–5 hr4–5 hr4–5 hr
Crane requiredNoNoNo
Roof reinforcementNot requiredNot requiredNot required
Total installed, 7 m × 1 m≈ €9,000≈ €12,500≈ €17,500

Custom geometry

Heights to 30 m and diameters to 1,500 mm are within the standard structural envelope. Beyond that the guy geometry and vortex-shedding assessment drive the design and we quote it individually.

Mixed streams

Where a plant vents several processes into one stack, the duct is specified for the worst-case combination rather than the average. Send us all of them.

What arrives

Two Euro-pallets: skeleton modules, guy assemblies, base module, the rolled duct, the tensioning tool and gauge, fixings, and the installation and commissioning pack.

Next step

Have the selector checked by someone who has seen your stream before

Three questions gets you close. An engineer reading your actual temperatures, chemistry and duty cycle gets you right — and will tell you if the cheaper option would have done, which happens more often than you would expect.

Request a quote → Price it first
ReplyWithin two working days, from an engineer rather than a mailbox
You getA specification recommendation, an indicative installed price and the structural basis behind it
CostNothing, and no obligation
Or emailengineering@exostack.com
Price it Request a quote