Round EPP Duct, 1.5m Length — 125mm, 160mm & 200mm

Description

The Casavent Round EPP Duct is a rigid duct section, 1.5 metres long, manufactured from Expanded Polypropylene (EPP) in two interlocking halves. Being made of EPP, the duct is inherently insulating, so runs built from this material typically don't need a separate insulation wrap — useful for reducing condensation risk and heat loss on exposed or loft-void ductwork.

The two-half construction allows the duct to be fitted around obstructions or opened up during installation, which can simplify routing in retrofit projects compared with a single-piece rigid tube. It's available in three diameters to match the airflow needs of the run — 125mm, 160mm, and 200mm.

3 Sizes

125 / 160 / 200mm

1.5m

Length

EPP

Material

2-Half

Construction

λ 0.038-0.039

Thermal Conductivity

-25 to +80°C

Service Temperature

System Component

This is a component of the Casavent EPP radial ducting system — connecting fittings and couplers are sold separately.

Insulating by Nature

EPP has a low thermal conductivity, so duct runs built from this material provide useful thermal insulation without a separate wrap, helping reduce condensation risk and heat loss.

Two-Half Construction

Manufactured in two interlocking halves, the duct can be opened and fitted around existing services or obstructions, which can simplify installation compared with feeding a single-piece rigid tube through a void.

Lightweight Rigid Duct

EPP construction gives a duct that is both rigid and lightweight, easing handling and reducing the load on suspension and fixing points.

Three Diameters to Match Airflow

Available in 125mm, 160mm, and 200mm, so the duct size can be matched to the airflow demand of each run without over- or under-sizing.

Corrosion-Free

As a moulded plastic component, the duct is immune to corrosion, unlike galvanised steel ductwork, giving long service life in damp loft or void conditions.

Good Acoustic Properties

The closed-cell EPP structure offers useful sound-deadening properties compared with thin-wall metal ductwork.

Product Code

Diameter

Length

RD125-1.5M-EPP

125mm

1.5m

RD160-1.5M-EPP

160mm

1.5m

RD200-1.5M-EPP

200mm

1.5m

Technical Data

Material

Expanded Polypropylene (EPP)

Thermal Conductivity

λ ≈ 0.038–0.039 W/(m·K)

Service Temperature

-25°C to +80°C

Microbial Resistance

Rating 1a, Method A (EN ISO 846:2019)

Air-Tightness

Suitable for ATC2 (D) air-tightness class systems (EN 17192)

Specification Notice

These products are manufactured in two interlocking halves, per the manufacturer's specification. The general material properties in the technical table (thermal conductivity, service temperature, microbial resistance, air-tightness class) reflect the wider EPP round ducting product family and are consistent across all diameters.

What is this duct made from?

Expanded Polypropylene (EPP) — a rigid, lightweight, and inherently insulating material.

Which diameter should I choose?

125mm suits lower-airflow runs, 160mm suits mid-capacity runs, and 200mm suits the highest-airflow duct runs in the range.

Does this duct need extra insulation?

EPP's low thermal conductivity means duct runs built from this material typically don't need a separate insulation wrap, unlike bare metal ductwork.

What does 'two interlocking halves' mean for installation?

The duct is manufactured in two halves that interlock together, allowing it to be fitted around obstructions or existing services rather than needing to be fed through as a single piece.

What connects to this duct?

Matching-diameter round bends, tees, and PVC couplers from the same Casavent EPP range.

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Room Dimensions

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Insulation Level

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Average

Good (New Build)

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