Flame-retardant

PROTAPE® PVC 371 (LD)

Highly flexible PVC ventilation hose with spring steel wire embedded in the wall and fabric reinforcement. The LD variant (Light Duty) is the lightest in the PROTAPE® PVC 371 range — 6:1 compressible and easy to handle. Service from −10 °C to +80 °C, short-term peak up to +110 °C. Designed for ventilation and extraction applications where flame retardance is required.

Download datasheet (PDF)

NF P 92-503 M2 −10 to +80 °C Peak +110 °C Fabric-reinforced

Flame-retardant NF P 92-503 M2
−10 to +80 °C
Peak +110 °C
Highly flexible
Fabric-reinforced
Cut to length

Why this hose?

PROTAPE® PVC 371 (LD) belongs to the PROTAPE® PVC 371 range — a broadly used family of flame-retardant ventilation hoses with spring steel wire in the wall. The lightest (LD) variant of PROTAPE® PVC 371 is what distinguishes this variant from the others in the range.

The spring steel wire embedded in the wall gives shape stability and bend resistance, combined with the PVC wall's flexibility and the fabric reinforcement's abrasion resistance. The result is a versatile ventilation hose that can both be bent and hold shape — important in installations where the hose must follow moving structures or complex pipe routings.

Where it is used

The hose typically sits in industrial ventilation and extraction systems, from smaller machine connections to central extraction systems. Flexibility and flame retardance are both essential parameters in most installations.

In HVAC installations it serves as connection between fixed pipework and equipment — where temperature can swing seasonally and fire authority requirements for materials must be respected.

In everyday talk we call it a "flame-retardant ventilation hose" — the go-to when air needs moving without the hose cover itself becoming the fire source.

Technical specifications

Technical specifications for PROTAPE® PVC 371 (LD).

Material	PVC wall, fabric-reinforced, spring steel wire
Colour	Grey
Temperature	−10 to +80 °C
Temperature (peak)	+110 °C
Flame retardance	NF P 92-503 M2
Conformity	NF P 92-503 M2, RoHS
Cut to length	Yes
Manufacturer SKU group	3710000

Dimensions and ordering

Standard dimensions for PROTAPE® PVC 371 (LD).

Dimensions, pressure and vacuum data for PROTAPE® PVC 371 (LD)
Inner Ø [mm]	Outer Ø [mm]	Wall thickness [mm]	Working pressure DIN 26057, 10 % elong. [bar]	Vacuum axially fixed [bar]	Bend radius [mm]	Max. length [m]	Weight [kg/m]	Roll [m]	Article no.
40	45	0.25	0.3	0.17	23	15	0.11	—	37100400000
45	50	0.25	—	—	—	10	0.12	—	37100450000
50.5	55.5	0.25	0.24	0.145	29	15	0.14	6	37100510000
50.5	55.5	0.25	—	—	—	15	0.14	—	37100500000
60	65	0.25	0.2	0.11	33	15	0.16	10	37100600000
64.5	69.5	0.25	—	—	—	15	0.17	—	37100630000
75.6	80.6	0.25	0.16	0.08	41	15	0.18	10	37100760000
80	85	0.25	0.15	0.08	43	15	0.2	10	37100800000
90	95	0.25	0.135	0.07	48	15	0.22	—	37100900000
101.5	107	0.25	0.12	0.05	54	15	0.27	6, 10	37101020000
110	115.5	0.25	0.11	0.045	58	15	0.3	10	37101100000
114	119.5	0.25	—	—	—	15	0.31	—	37101140000
126.5	132	0.25	0.095	0.035	67	15	0.34	6, 10	37101270000
140	145.5	0.25	0.085	0.035	73	15	0.38	10	37101400000
151.5	157	0.25	0.08	0.035	79	15	0.41	6, 10	37101520000
160	165.5	0.25	0.075	0.02	83	15	0.35	6, 10	37101600000
165	170.5	0.25	—	—	—	15	0.36	—	37101650000
180	186.5	0.25	0.065	0.02	93	15	0.4	10	37101800000
202.3	208.3	0.25	0.06	0.02	105	15	0.6	6, 10	37102030000
254	260	0.25	0.045	0.015	131	15	0.78	6, 10	37102540000
305	311	0.25	0.04	0.01	157	15	0.93	10	37103050000
315	321	0.25	—	—	—	10	0.96	—	37103150000
356	362	0.25	0.035	0.01	182	10	1.08	10	37103560000
406	412	0.25	0.03	0.005	207	10	1.23	10	37104060000
508	514	0.25	0.025	0.005	260	10	1.54	—	37105080000

Fields without a value (—) are not specified in the manufacturer's factsheet. Overpressure and underpressure values are recommended operating limits; the product can be subjected to higher loads on request. Bend radius is measured along the inside of the hose bend.

Standards and compliance

PROTAPE® PVC 371 (LD) conforms to:

NF P 92-503 M2. Flame retardance standard.
RoHS. Directive 2011/65/EU.
REACH (EC 1907/2006). The manufacturer's REACH declaration is available for download.

Documentation and downloads

Additional documents about this hose, its compliance and installation. Click to download as PDF in a new tab.

Datasheet (Particulair) Our 4-page datasheet with specifications, dimension table, applications and contact info. PDF REACH declaration Manufacturer declaration of REACH compliance (EC 1907/2006). PDF · 2026 RoHS declaration Manufacturer declaration of RoHS directive compliance. PDF · 2025 ISO 9001 certificate Quality management certificate for the production. PDF Installation guidelines General installation guidelines. PDF · 2025

Help with material selection

Although this hose isn't ATEX-relevant, these two articles provide useful background on electrical resistance and industrial safety — important if you later combine the hose with electrical equipment or work in mixed environments:

ESD

The invisible weakest link

Why a conductive or antistatic hose isn't sufficient on its own — and what grounding means for the complete system.

Read the article

ESD

Know your ohm

The difference between antistatic and conductive, which resistance limits apply where, and how to measure them correctly.

Read the article

Industries that use it

The PROTAPE® PVC 371 family is used across industries where air needs moving without the hose cover itself becoming the fire source:

In ordinary ventilation and extraction installations the hose combines flexibility with shape stability — important parameters when the hose must be routed around obstacles.

In HVAC and air conditioning systems it's used in smaller dimensions as flexible connectors. In industrial ventilation it's used in larger dimensions as the main system trunk.

Custom lengths and assemblies

The hose is delivered on 10 m and 20 m rolls. We cut to length and fit fittings, sleeves or couplings as a finished assembly.

For serial deliveries we can establish consistent assembly across the delivery.

See our custom hose assemblies

Related hoses

Hoses often considered alongside this one. Suggestions are based on the same category and similar properties.

Frequently asked questions

What's the difference between LD, MD and HD in PROTAPE® PVC 371?

LD (Light Duty) is the lightest, most compressible (6:1) and used where handling is frequent. MD (Medium Duty) is the versatile variant. HD (Heavy Duty) is the heaviest with thicker wall and wider temperature range. Choose LD when the hose must be moved often and be easy to route.

What does NF P 92-503 M2 mean?

French fire class standard; M2 corresponds to "hard to ignite". The M scale runs from M0 (non-flammable) to M4 (easily flammable). M2 is the usual norm for ventilation hoses in public buildings and vehicles.

Is it ATEX-approved?

No. The PVC wall is insulating. For ATEX zones choose a conductive or antistatic variant — for example PROTAPE® PUR 332 SE (LD).

How big is the bend radius?

Bend radius is shown in the dimension table for each inner diameter. The LD variant is 6:1 compressible, meaning it can be compressed to one-sixth of its length when pressed together — making handling and storage easy.

Does it tolerate hot air from welding fume?

Yes, up to +80 °C continuous and short-term peak up to +110 °C. This covers normal welding fume temperature. For continuous service above +80 °C choose the HT variant (PROTAPE® PVC 371 HT (LD), service up to +110 °C).

Can I get it with couplings?

Yes. We cut the hose to length and fit hose bands, clamping bands or bayonet couplings as a finished assembly.