Free delivery available | Free Help & Advice: hello@efans.co.uk | Mon - Fri 9:00am - 5:00pm

Next Working Day Delivery

On select items. Order by 12pm

Credit Accounts

Pay on 30-day terms

Easy 14 day returns

No quibble easy returns

Trustpilot Rated Excellent

4.9 out of 5 stars

RAW Roof Cowl Accessories

24 products

Accessories for RAW roof cowls and roof-mounted extract fans — everything needed to mount and weather the roof penetration. The range covers Systemair BDS backdraught shutters (200–1000), purlin boxes (PB) that provide a mounting kerb through profiled and purlin roofs, and soaker sheets (SKR) that flash and weatherproof the opening. All sized to match the RAW cowl and fan range from 200 to 1000.

UK stock with next-day delivery available and trade pricing on project quantities. Not sure which accessories your cowl needs? Email hello@efans.co.uk or call 0161 399 3825 with the cowl size.

Purlin Box / Soaker Sheet / Cased Axial Fans

What is a purlin box?

A purlin box is a mounting kerb that sits between the roof structure and the roof cowl or fan, spanning the purlins to give a solid, level base for the unit on a profiled or industrial roof. It raises the fan clear of the roof surface and provides a fixing point sized to the cowl.

What is a soaker sheet?

A soaker sheet (SKR) is a flashing that weatherproofs the roof penetration around the cowl or fan base, dressing into the roof covering to keep the opening watertight. It's matched to the cowl diameter.

What does a backdraught shutter do?

A backdraught shutter (Systemair BDS) is a gravity or spring-loaded flap that opens with fan airflow and closes when the fan stops, preventing wind and cold air blowing back down the duct. Fit one on roof and wall extract terminations to stop reverse flow.

How do I match accessories to my cowl?

All three accessory types are sized to the same 200–1000 range as the RAW cowls and fans — order the size that matches your cowl (e.g. a 300/315 cowl takes the 300/315 purlin box, soaker and shutter). Tell us the cowl model and we'll list the matching parts.

Showing 1 - 24 of 24 products

Systemair BDS 200/250 RA Backdraft Shutter - eFans Direct Ltd

Systemair BDS 200/250 RA Backdraft Shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 200/250 RA Backdraft Shutter

For 200/250 RA Roof Terminals
Backdraught Shutter
Systemair RAW Range

In stock

Next day delivery available

£90.19

Systemair BDS 300/315 RA Backdraft Shutter - eFans Direct Ltd

Systemair BDS 300/315 RA Backdraft Shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 300/315 RA Backdraft Shutter

For 300/315 RAW Roof Terminals
Gravity Backdraught Shutter
Systemair RA Roof Terminal System

In stock

Next day delivery available

£128.69

Systemair BDS 350 RA Backdraft Shutter - eFans Direct Ltd

Systemair BDS 350 RA Backdraft Shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 350 RA Backdraft Shutter

350 Backdraught Shutter
Prevents Reverse Airflow
Compatible With RAW Roof Terminals

In stock

Next day delivery available

£166.09

Systemair BDS 400/450 RA Backdraft Shutter - eFans Direct Ltd

Systemair BDS 400/450 RA Backdraft Shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 400/450 RA Backdraft Shutter

400/450mm Backdraught Shutter
Gravity Shutter Prevents Reverse Airflow
For Systemair RAW Side Discharge Roof Cowls

In stock

Next day delivery available

£175.99

Systemair BDS 500/560 RA Backdraft Shutter - eFans Direct Ltd

Systemair BDS 500/560 RA Backdraft Shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 500/560 RA Backdraft Shutter

500/560mm Diameter
Backdraught Shutter
For Systemair RAW Roof Cowl

In stock

Next day delivery available

£211.19

eFans Direct Ltd PB 200/250 Purlin Box Roof Cowl showing metallic construction and mounting flange for roof installation.

eFans Direct Ltd PB 200/250 Purlin Box Roof Cowl showing metallic construction and mounting flange for roof installation.

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8602

PB 200/250 Purlin Box

200/250mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£215.86

PB 500/560 Purlin Box

PB 500/560 Purlin Box

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8693

PB 300/315 Purlin Box

300/315mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£243.09

Systemair BDS 630/710 RA Backdraft Shutter - eFans Direct Ltd

Systemair BDS 630/710 RA Backdraft Shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 630/710 RA Backdraft Shutter

630/710mm
Backdraft Shutter
Gravity Operated

In stock

Next day delivery available

£266.19

PB 350 Purlin Box - eFans Direct Ltd

PB 350 Purlin Box - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8694

PB 350 Purlin Box

350mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£280.49

Systemair BDS 800 RA Backdraft Shutter - eFans Direct Ltd

Systemair BDS 800 RA Backdraft Shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 800 RA Backdraft Shutter

For 800 RA Roof Cowl
Backdraught Shutter
Systemair RAW Side Discharge

In stock

Next day delivery available

£315.69

PB 400/450 Purlin Box - eFans Direct Ltd

PB 400/450 Purlin Box - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8695

PB 400/450 Purlin Box

400/450mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£338.79

Systemair BDS 1000 RA backdraft shutter - eFans Direct Ltd

Systemair BDS 1000 RA backdraft shutter - eFans Direct Ltd

In stock

Next day delivery
available

Systemair

Systemair BDS 1000 RA backdraft shutter

1000mm
Backdraft Shutter
Gravity Operated

In stock

Next day delivery available

£356.39

PB 500/560 Purlin Box

PB 500/560 Purlin Box

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8696

PB 500/560 Purlin Box

500/560mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£411.39

PB 630/710 Purlin Box - eFans Direct Ltd

PB 630/710 Purlin Box - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8697

PB 630/710 Purlin Box

630/710mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£533.49

Systemair PB 1000 Purlin Box - eFans Direct Ltd

Systemair PB 1000 Purlin Box - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8699

PB 1000 Purlin Box

1000mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£691.89

PB 800 Purlin Box - eFans Direct Ltd

PB 800 Purlin Box - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8698

PB 800 Purlin Box

800mm
GRP purlin box
Supports RAW/RAV roof terminals

In stock

Next day delivery available

£696.29

SKR 200/250 RA Soaker Sheet - eFans Direct Ltd

SKR 200/250 RA Soaker Sheet - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8458

SKR 200/250 RA Soaker Sheet

For 200/250 RA Roof Terminals
UV Stabilised Soaker Sheet
Glass Reinforced Polyester

In stock

Next day delivery available

£1,087.89

SKR 300/315 RA soaker sheet - eFans Direct Ltd

SKR 300/315 RA soaker sheet - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8461

SKR 300/315 RA Soaker Sheet

300/315mm RA Soaker Sheet
UV Stabilised Glass Reinforced Polyester
For RAW And RAV Roof Terminals

In stock

Next day delivery available

£1,087.89

SKR 350 RA soaker sheet - eFans Direct Ltd

SKR 350 RA soaker sheet - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8459

SKR 350 RA Soaker Sheet

For RAW And RAV Roof Terminals
Soaker Sheet
UV Stabilised Glass Reinforced Polyester

In stock

Next day delivery available

£1,087.89

SKR 400/450 RA soaker sheet - eFans Direct Ltd

SKR 400/450 RA soaker sheet - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8460

SKR 400/450 RA Soaker Sheet

400/450mm
Soaker Sheet
GRP Polyester

In stock

Next day delivery available

£1,113.19

SKR 500/560 RA soaker sheet - eFans Direct Ltd

SKR 500/560 RA soaker sheet - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8462

SKR 500/560 RA Soaker Sheet

For RAW & RAV Roof Terminals
UV Stabilised GRP Soaker Sheet
Made to Order, Any BS or RAL Colour

In stock

Next day delivery available

£1,113.19

eFans Direct Ltd SKR 630/710 RA roof cowl soaker sheet with metal edge for ventilation and weather protection in roofing systems

eFans Direct Ltd SKR 630/710 RA roof cowl soaker sheet with metal edge for ventilation and weather protection in roofing systems

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8463

SKR 630/710 RA Soaker Sheet

For 630/710 RA Roof Terminals
UV Stabilised GRP Soaker Sheet
Any BS Or RAL Colour

In stock

Next day delivery available

£1,197.89

SKR 800 RA soaker sheet - eFans Direct Ltd

SKR 800 RA soaker sheet - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8464

SKR 800 RA Soaker Sheet

For 800 RA Roof Terminals
UV Stabilised Soaker Sheet
Glass Reinforced Polyester

In stock

Next day delivery available

£1,245.19

SKR 1000 RA Soaker Sheet - eFans Direct Ltd

SKR 1000 RA Soaker Sheet - eFans Direct Ltd

In stock

Next day delivery
available

eFans Direct Ltd SKU: 8465

SKR 1000 RA Soaker Sheet

For 1000 RA Roof Terminals
UV Stabilised GRP Soaker Sheet
Any BS Or RAL Colour

In stock

Next day delivery available

£1,245.19